Control system for a particle accelerator

An example particle therapy system includes a particle accelerator to output a particle beam, where the particle accelerator includes: a particle source to provide pulses of ionized plasma to a cavity, where each pulse of the particle source has a pulse width corresponding to a duration of operation of the particle source to produce the corresponding pulse, and where the particle beam is based on the pulses of ionized plasma; and a modulator wheel having different thicknesses, where each thickness extends across a different circumferential length of the modulator wheel, and where the modulator wheel is arranged to receive a precursor to the particle beam and is configured to create a spread-out Bragg peak for the particle beam.

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Description
CROSS-REFERENCE TO RELATED APPLICATION

Priority is hereby claimed to U.S. Provisional Application No. 61/707,645, which was filed on Sep. 28, 2012. The contents of U.S. Provisional Application No. 61/707,645 are hereby incorporated by reference into this disclosure.

TECHNICAL FIELD

This disclosure relates generally to a control system for a particle accelerator.

BACKGROUND

Particle therapy systems use a particle accelerator to generate a particle beam for treating afflictions, such as tumors. A control system manages the behavior of the particle accelerator to ensure that it operates as desired.

SUMMARY

An example particle therapy system may include a particle accelerator to output a particle beam, where the particle accelerator includes: a particle source to provide pulses of ionized plasma to a cavity, where each pulse of the particle source has a pulse width corresponding to a duration of operation of the particle source to produce the corresponding pulse, and where the particle beam is based on the pulses of ionized plasma; and a modulator wheel having different thicknesses, where each thickness extends across a different circumferential length of the modulator wheel, and where the modulator wheel is arranged to receive a precursor to the particle beam and is configured to create a spread-out Bragg peak for the particle beam. The example particle therapy system also includes one or more first input/output (I/O) modules operable at a first speed, where the one or more first I/O modules are configured to send machine instructions to one or more motor controllers, at least one of which is for controlling the modulator wheel; and one or more second I/O modules operable at a second speed that is greater than the first speed, at least one of which is configured to send machine instructions to the particle source so that pulse widths of the particle source vary with rotational positions of the modulator wheel. The example particle therapy system may also include one or more of the following features:

The example particle therapy system may include: a therapy control computer programmed to receive prescription information from a hospital, to translate the prescription information to machine information, and to send treatment records to the hospital; and a master control computer having a real-time operating system, where the master control computer is programmed to receive machine information from the therapy control computer, to translate the machine information into machine instructions, and to send the machine instructions to one or more of the first I/O modules and the second I/O modules.

The example particle therapy system may include an optical fiber over which is monitored a rotational speed and position of the modulator wheel. A speed of the first I/O modules may be on the order of milliseconds and a speed of the second I/O modules may be on the order of one or more hundreds of nanoseconds.

The first I/O modules may be programmable logic controllers (PLC). At least one of the PLCs may be programmed to send machine instructions to motor controllers for controlling a field shaping wheel system for shaping the particle beam prior to output. At least one of the PLCs may be programmed to send machine instructions to a motor controller for controlling a scattering system for collimating the particle beam prior to output.

The example particle therapy system may include a radio frequency (RF) system to sweep RF frequencies through the cavity to extract particles from a plasma column produced by the particle source, where the RF system includes a rotating capacitor. At least one of the PLCs may be programmed to send machine instructions to a motor controller that controls the rotating capacitor. Two or more of the PLCs may be configured to communicate with one another.

The example particle therapy system may include a rotatable gantry on which the particle accelerator is mounted. At least one of the PLCs may be programmed to send machine instructions to a motor controller that controls the rotatable gantry.

The second I/O modules may be field-programmable gate arrays (FPGA). The example particle therapy system may include a circuit board including a microprocessor. At least one of the FPGAs may be on the circuit board and in communication with the microprocessor. The microprocessor may be programmed to communicate with a control computer.

The example particle therapy system may include a radio frequency (RF) system to sweep RF frequencies through the cavity to extract particles from a plasma column produced by the particle source. At least one of the FPGAs may be an RF control module. The RF control module may be configured to receive information about a rotation of the modulator wheel and, based thereon, to coordinate operational aspects of the particle source and the RF system. Coordinating operational aspects of the particle source and the RF system may include turning the particle source on or off based on a rotational position of the modulator wheel, and turning the RF system on or off based on a rotational position of the modulator wheel. The RF control module may be configured to send machine instruction to the particle source to turn-on when an RF voltage is at a certain frequency and to turn-off when the RF voltage is at a certain frequency. Coordinating operational aspects of the particle source may include specifying pulse widths during turn-on times of the particle source.

An example particle therapy system may include a particle accelerator to output a particle beam included of pulses and a depth modulator that is in a path of the particle beam. The depth modulator has a variable thickness and is movable so that the particle beam impacts different thicknesses of the depth modulator at different times. The particle therapy system is configured to control numbers of pulses that impact the different thicknesses of the depth modulator. The example particle therapy system may include one or more of the following features, either alone or in combination.

Movement of the depth modulator may be controllable so that different numbers of pulses impact at least two different thicknesses of the depth modulator. The particle therapy system may include a control system to provide control signals and a motor to control movement of the depth modulator in response to the control signals, where the movement is rotation that is controllable by the control signals.

Output of pulses from the accelerator may be controlled so that different numbers of pulses impact at least two different thicknesses of the depth modulator. The particle accelerator may include a particle source configured to generate a plasma stream from which the pulses are extracted, where the plasma stream is generated in response to voltage applied to ionized gas, and the voltage is controllable to turn the particle source on and off to control the number of pulses that impact the at least two different thicknesses. The particle accelerator may include a particle source configured to generate a plasma stream from which the pulses are extracted; and a radio frequency (RF) source to sweep frequencies and thereby extract one or more pulses from the plasma stream at each frequency sweep. The RF source may be controllable to control numbers of pulses that impact different thicknesses of the depth modulator. The RF source may be controllable to skip one or more frequency sweeps. The particle therapy system may be configured by including one or more structures to deflect pulses so as to control numbers of pulses that impact different thicknesses of the depth modulator.

An example particle therapy system may include a particle accelerator to output a particle beam, where the accelerator includes: a particle source to provide pulses of ionized plasma to a cavity, where each pulse of the particle source has a pulse width corresponding to a duration of operation of the particle source to produce the corresponding pulse, and where the particle beam is based on the pulses of ionized plasma; and a modulator wheel having different thicknesses, where each thickness extends across a different circumferential length of the modulator wheel, and where the modulator wheel is arranged to receive a precursor to the particle beam and is configured to create a spread-out Bragg peak for the particle beam. The particle therapy system may be configured so that pulse widths of the particle source vary with rotational positions of the modulator wheel.

Two or more of the features described in this disclosure, including those described in this summary section, may be combined to form implementations not specifically described herein.

Control of the various systems described herein, or portions thereof, may be implemented via a computer program product that includes instructions that are stored on one or more non-transitory machine-readable storage media, and that are executable on one or more processing devices. The systems described herein, or portions thereof, may be implemented as an apparatus, method, or electronic system that may include one or more processing devices and memory to store executable instructions to implement control of the stated functions.

The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features, objects, and advantages will be apparent from the description and drawings, and from the claims.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an example particle therapy system.

FIG. 2 is an exploded perspective view of components of an example synchrocyclotron.

FIGS. 3, 4, and 5 are cross-sectional views of an example synchrocyclotron.

FIG. 6 is a perspective view of an example synchrocyclotron.

FIG. 7 is a cross-sectional view of a portion of an example reverse bobbin and windings.

FIG. 8 is a cross-sectional view of an example cable-in-channel composite conductor.

FIG. 9 is a cross-sectional view of an example particle source.

FIG. 10 is a perspective view of an example dee plate and a dummy dee.

FIG. 11 is a perspective view of an example vault.

FIG. 12 is a perspective view of an example treatment room with a vault.

FIG. 13 shows a patient positioned next to a particle accelerator.

FIG. 14 shows a patient positioned within an example inner gantry in a treatment room.

FIG. 15 is a block diagram showing an example of a control system for a particle accelerator.

FIG. 16 shows an example field shaping wheel system.

FIG. 17 is a side view showing a beam path that includes an example modulator wheel and an example scatterer.

FIG. 18 is a graph showing various Bragg peaks and the cumulative effect that produces a spread-out Bragg peak.

FIG. 19 is a side view of an example modulator wheel for producing Bragg peaks at different depths and intensity levels.

FIG. 20 is a top view of the modulator wheel of FIG. 19.

FIG. 21 is a graph showing a frequency sweep and a particle source pulse width output during a period of the frequency sweep.

FIG. 22 is a graph showing spread-out Bragg peaks at different depths within a patient.

FIG. 23 is a graph showing particle source pulse width relative to the angle of the modulation wheel for the spread-out Bragg peaks of FIG. 22.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION Overview

Described herein is an example of a control system for an example particle accelerator for use in a system, such as a proton or ion therapy system. The example particle therapy system includes a particle accelerator—in this example, a synchrocyclotron—mounted on a gantry. The gantry enables the particle accelerator to be rotated around a patient position, as explained in more detail below. In some implementations, the gantry is steel and has two legs mounted for rotation on two respective bearings that lie on opposite sides of a patient. The particle accelerator is supported by a steel truss that is long enough to span a treatment area in which the patient lies and that is attached stably at both ends to the rotating legs of the gantry. As a result of rotation of the gantry around the patient, the particle accelerator also rotates.

In an example implementation, the particle accelerator (e.g., the synchrocyclotron) includes a cryostat that holds a superconducting coil for conducting a current that generates a magnetic field (B). In this example, the cryostat uses liquid helium (He) to maintain the coil at superconducting temperatures, e.g., 4° Kelvin (K). Magnetic yokes are adjacent (e.g., around) the cryostat, and define a cavity in which particles are accelerated. The cryostat is attached to the magnetic yokes through straps or the like.

In this example implementation, the particle accelerator includes a particle source (e.g., a Penning Ion Gauge—PIG source) to provide a plasma column to the cavity. Hydrogen gas is ionized to produce the plasma column. A voltage source provides a radio frequency (RF) voltage to the cavity to accelerate particles from the plasma column. As noted, in this example, the particle accelerator is a synchrocyclotron. Accordingly, the RF voltage is swept across a range of frequencies to account for relativistic effects on the particles (e.g., increasing particle mass) when extracting particles from the column. The magnetic field produced by the coil causes particles accelerated from the plasma column to accelerate orbitally within the cavity. A ferromagnetic arrangement (e.g., a magnetic regenerator) is positioned in the cavity to adjust the existing magnetic field inside the cavity to thereby change locations of successive orbits of the particles accelerated from the plasma column so that, eventually, the particles output to an extraction channel that passes through the yokes. The extraction channel receives particles accelerated from the plasma column and outputs the received particles from the cavity. Elements both inside and outside the extraction channel shape and focus the particle beam for application.

A control system can control the behavior of the particle accelerator. In operation, a particle beam from the particle accelerator is applied to a patient in accordance with a particular treatment plan. A prescription defines operational characteristics of the particle therapy system that are used to implement the treatment plan. Although a prescription may specify any number of operational characteristics appropriate to a particular particle therapy system, in an implementation, the prescription specifies one or more of the following: particle dose, particle dose rate, patient position (as defined by a “couch” on which the patient lies), patient couch rotational angle, gantry rotational angle, beam field size, beam depth, an extent of the beam depth, a configuration of an aperture used to limit the area of the particle beam, and a configuration of a range compensating bolus (or, simply, “bolus”) used to customize the penetration depth of the particle beam.

The control system can include a Therapy Control Computer (TCC) that includes a user interface. In an example, the TCC is programmed to receive prescriptions from a hospital and to send treatment records to the hospital. The TCC can also translate the prescription into machine instructions, including, but not limited to, commands, parameters, and/or other machine-usable information.

The TCC can send the translated machine instructions to a Master Control Computer (MCC). The MCC can include a real-time operating system to execute commands at exact times in an exact order. In an example, the MCC is programmed to send machine instructions to slow and fast input/output modules.

In an example implementation, the slow I/O modules are used to send instructions to motor controllers. The motor controllers may control any movable component of the particle accelerator (e.g., field shaping wheels, scattering foils, a rotating capacitor, a depth modulator wheel, the gantry, etc.).

In an example implementation, the fast I/O modules are used for more time sensitive control. For example, it could be appropriate to use the fast I/O module to control an RF voltage source and/or a particle source (because it can be important for one to be turned at exact times relative to the other). The fast I/O modules can also be used to receive data that samples the position of the modulator wheel (because a very high sampling rate may be appropriate).

The slow and fast I/O modules use the machine instructions to configure the particle therapy system so that it has operational characteristics appropriate for the treatment plan. The particle therapy system is configurable on a case-by-case basis.

The techniques described herein for controlling the particle therapy system are not limited to use with a particular particle therapy system, but rather may be used in any appropriate particle therapy system. The foregoing techniques also may be used in other appropriate medical treatment or diagnostic systems.

An example of a particle therapy system in which the foregoing techniques may be used is provided below.

EXAMPLE PARTICLE THERAPY SYSTEM

Referring to FIG. 1, a charged particle radiation therapy system 500 includes a beam-producing particle accelerator 502 having a weight and size small enough to permit it to be mounted on a rotating gantry 504 with its output directed straight (that is, essentially directly) from the accelerator housing toward a patient 506.

In some implementations, the steel gantry has two legs 508, 510 mounted for rotation on two respective bearings 512, 514 that lie on opposite sides of the patient. The accelerator is supported by a steel truss 516 that is long enough to span a treatment area 518 in which the patient lies (e.g., twice as long as a tall person, to permit the person to be rotated fully within the space with any desired target area of the patient remaining in the line of the beam) and is attached stably at both ends to the rotating legs of the gantry.

In some examples, the rotation of the gantry is limited to a range 520 of less than 360 degrees, e.g., about 180 degrees, to permit a floor 522 to extend from a wall of the vault 524 that houses the therapy system into the patient treatment area. The limited rotation range of the gantry also reduces the required thickness of some of the walls, which provide radiation shielding of people outside the treatment area. A range of 180 degrees of gantry rotation is enough to cover all treatment approach angles, but providing a larger range of travel can be useful. For example the range of rotation may be between 180 and 330 degrees and still provide clearance for the therapy floor space.

The horizontal rotational axis 532 of the gantry is located nominally one meter above the floor where the patient and therapist interact with the therapy system. This floor is positioned about 3 meters above the bottom floor of the therapy system shielded vault. The accelerator can swing under the raised floor for delivery of treatment beams from below the rotational axis. The patient couch moves and rotates in a substantially horizontal plane parallel to the rotational axis of the gantry. The couch can rotate through a range 534 of about 270 degrees in the horizontal plane with this configuration. This combination of gantry and patient rotational ranges and degrees of freedom allow the therapist to select virtually any approach angle for the beam. If needed, the patient can be placed on the couch in the opposite orientation and then all possible angles can be used.

In some implementations, the accelerator uses a synchrocyclotron configuration having a very high magnetic field superconducting electromagnetic structure. Because the bend radius of a charged particle of a given kinetic energy is reduced in direct proportion to an increase in the magnetic field applied to it, the very high magnetic field superconducting magnetic structure permits the accelerator to be made smaller and lighter. The synchrocyclotron uses a magnetic field that is uniform in rotation angle and falls off in strength with increasing radius. Such a field shape can be achieved regardless of the magnitude of the magnetic field, so in theory there is no upper limit to the magnetic field strength (and therefore the resulting particle energy at a fixed radius) that can be used in a synchrocyclotron.

Superconducting materials lose their superconducting properties in the presence of very high magnetic fields. High performance superconducting wire windings are used to allow very high magnetic fields to be achieved. Superconducting materials typically need to be cooled to low temperatures for their superconducting properties to be realized. In some examples described here, cryo-coolers are used to bring the superconducting coil windings to temperatures near absolute zero. Using cryo-coolers can reduce complexity and cost.

The synchrocyclotron is supported on the gantry so that the beam is generated directly in line with the patient. The gantry permits rotation of the cyclotron about a horizontal rotational axis that contains a point (isocenter 540) within, or near, the patient. The split truss that is parallel to the rotational axis, supports the cyclotron on both sides.

Because the rotational range of the gantry is limited, a patient support area can be accommodated in a wide area around the isocenter. Because the floor can be extended broadly around the isocenter, a patient support table can be positioned to move relative to and to rotate about a vertical axis 542 through the isocenter so that, by a combination of gantry rotation and table motion and rotation, any angle of beam direction into any part of the patient can be achieved. The two gantry arms are separated by more than twice the height of a tall patient, allowing the couch with patient to rotate and translate in a horizontal plane above the raised floor.

Limiting the gantry rotation angle allows for a reduction in the thickness of at least one of the walls surrounding the treatment room. Thick walls, typically constructed of concrete, provide radiation protection to individuals outside the treatment room. A wall downstream of a stopping proton beam may be about twice as thick as a wall at the opposite end of the room to provide an equivalent level of protection. Limiting the range of gantry rotation enables the treatment room to be sited below earth grade on three sides, while allowing an occupied area adjacent to the thinnest wall reducing the cost of constructing the treatment room.

In the example implementation shown in FIG. 1, the superconducting synchrocyclotron 502 operates with a peak magnetic field in a pole gap of the synchrocyclotron of 8.8 Tesla. The synchrocyclotron produces a beam of protons having an energy of 250 MeV. In other implementations the field strength could be in the range of 6 to 20 Tesla or 4 to 20 Tesla and the proton energy could be in the range of 150 to 300 MeV

The radiation therapy system described in this example is used for proton radiation therapy, but the same principles and details can be applied in analogous systems for use in heavy ion (ion) treatment systems.

As shown in FIGS. 2, 3, 4, 5, and 6, an example synchrocyclotron 10 (e.g., 502 in FIG. 1) includes a magnet system 12 that contains an particle source 90, a radiofrequency drive system 91, and a beam extraction system 38. The magnetic field established by the magnet system has a shape appropriate to maintain focus of a contained proton beam using a combination of a split pair of annular superconducting coils 40, 42 and a pair of shaped ferromagnetic (e.g., low carbon steel) pole faces 44, 46.

The two superconducting magnet coils are centered on a common axis 47 and are spaced apart along the axis. As shown in FIGS. 7 and 8, the coils are formed by of Nb3Sn-based superconducting 0.8 mm diameter strands 48 (that initially comprise a niobium-tin core surrounded by a copper sheath) deployed in a twisted cable-in-channel conductor geometry. After seven individual strands are cabled together, they are heated to cause a reaction that forms the final (brittle) superconducting material of the wire. After the material has been reacted, the wires are soldered into the copper channel (outer dimensions 3.18×2.54 mm and inner dimensions 2.08×2.08 mm) and covered with insulation 52 (in this example, a woven fiberglass material). The copper channel containing the wires 53 is then wound in a coil having a rectangular cross-section of 8.55 cm×19.02 cm, having 26 layers and 49 turns per layer. The wound coil is then vacuum impregnated with an epoxy compound. The finished coils are mounted on an annular stainless steel reverse bobbin 56. Heater blankets 55 are placed at intervals in the layers of the windings to protect the assembly in the event of a magnet quench.

The entire coil can then be covered with copper sheets to provide thermal conductivity and mechanical stability and then contained in an additional layer of epoxy. The precompression of the coil can be provided by heating the stainless steel reverse bobbin and fitting the coils within the reverse bobbin. The reverse bobbin inner diameter is chosen so that when the entire mass is cooled to 4 K, the reverse bobbin stays in contact with the coil and provides some compression. Heating the stainless steel reverse bobbin to approximately 50 degrees C. and fitting coils at a temperature of 100 degrees Kelvin can achieve this.

The geometry of the coil is maintained by mounting the coils in a reverse rectangular bobbin 56 to exert a restorative force 60 that works against the distorting force produced when the coils are energized. As shown in FIG. 5, the coil position is maintained relative to the magnet yoke and cryostat using a set of warm-to-cold support straps 402, 404, 406. Supporting the cold mass with thin straps reduces the heat leakage imparted to the cold mass by the rigid support system. The straps are arranged to withstand the varying gravitational force on the coil as the magnet rotates on board the gantry. They withstand the combined effects of gravity and the large de-centering force realized by the coil when it is perturbed from a perfectly symmetric position relative to the magnet yoke. Additionally the links act to reduce dynamic forces imparted on the coil as the gantry accelerates and decelerates when its position is changed. Each warm-to-cold support includes one S2 fiberglass link and one carbon fiber link. The carbon fiber link is supported across pins between the warm yoke and an intermediate temperature (50-70 K), and the S2 fiberglass link 408 is supported across the intermediate temperature pin and a pin attached to the cold mass. Each link is 5 cm long (pin center to pin center) and is 17 mm wide. The link thickness is 9 mm. Each pin is made of high strength stainless steel and is 40 mm in diameter.

Referring to FIG. 3, the field strength profile as a function of radius is determined largely by choice of coil geometry and pole face shape; the pole faces 44, 46 of the permeable yoke material can be contoured to fine tune the shape of the magnetic field to ensure that the particle beam remains focused during acceleration.

The superconducting coils are maintained at temperatures near absolute zero (e.g., about 4 degrees Kelvin) by enclosing the coil assembly (the coils and the bobbin) inside an evacuated annular aluminum or stainless steel cryostatic chamber 70 that provides a free space around the coil structure, except at a limited set of support points 71, 73. In an alternate version (FIG. 4) the outer wall of the cryostat may be made of low carbon steel to provide an additional return flux path for the magnetic field.

In some implementations, the temperature near absolute zero is achieved and maintained using one single-stage Gifford-McMahon cryo-cooler and three two-stage Gifford McMahon cryo-coolers. Each two stage cryo-cooler has a second stage cold end attached to a condenser that recondenses Helium vapor into liquid Helium. The cryo-cooler heads are supplied with compressed Helium from a compressor. The single-stage Gifford-McMahon cryo-cooler is arranged to cool high temperature (e.g., 50-70 degrees Kelvin) leads that supply current to the superconducting windings.

In some implementations, the temperature near absolute zero is achieved and maintained using two Gifford-McMahon cryo-coolers 72, 74 that are arranged at different positions on the coil assembly. Each cryo-cooler has a cold end 76 in contact with the coil assembly. The cryo-cooler heads 78 are supplied with compressed Helium from a compressor 80. Two other Gifford-McMahon cryo-coolers 77, 79 are arranged to cool high temperature (e.g., 60-80 degrees Kelvin) leads that supply current to the superconducting windings.

The coil assembly and cryostatic chambers are mounted within and fully enclosed by two halves 81, 83 of a pillbox-shaped magnet yoke 82. In this example, the inner diameter of the coil assembly is about 74.6 cm. The iron yoke 82 provides a path for the return magnetic field flux 84 and magnetically shields the volume 86 between the pole faces 44, 46 to prevent external magnetic influences from perturbing the shape of the magnetic field within that volume. The yoke also serves to decrease the stray magnetic field in the vicinity of the accelerator.

As shown in FIGS. 3 and 9, the synchrocyclotron includes a particle source 90 of a Penning ion gauge geometry located near the geometric center 92 of the magnet structure 82. The particle source may be as described below, or the particle source may be of the type described in U.S. patent application Ser. No. 11/948,662 incorporated herein by reference.

Particle source 90 is fed from a supply 99 of hydrogen through a gas line 101 and tube 194 that delivers gaseous hydrogen. Electric cables 94 carry an electric current from a current source 95 to stimulate electron discharge from cathodes 192, 190 that are aligned with the magnetic field, 200.

In some implementations, the gas in gas tube 101 may include a mixture of hydrogen and one or more other gases. For example, the mixture may contain hydrogen and one or more of the noble gases, e.g., helium, neon, argon, krypton, xenon and/or radon (although the mixture is not limited to use with the noble gases). In some implementations, the mixture may be a mixture of hydrogen and helium. For example, the mixture may contain about 75% or more of hydrogen and about 25% or less of helium (with possible trace gases included). In another example, the mixture may contain about 90% or more of hydrogen and about 10% or less of helium (with possible trace gases included). In examples, the hydrogen/helium mixture may be any of the following: >95%/<5%, >90%/<10%, >85%/<15%, >80%/<20%, >75%/<20%, and so forth.

Possible advantages of using a noble (or other) gas in combination with hydrogen in the particle source may include: increased beam intensity, increased cathode longevity, and increased consistency of beam output.

In this example, the discharged electrons ionize the gas exiting through a small hole from tube 194 to create a supply of positive ions (protons) for acceleration by one semicircular (dee-shaped) radio-frequency plate 100 that spans half of the space enclosed by the magnet structure and one dummy dee plate 102. In the case of an interrupted particle source (an example of which is described in U.S. patent application Ser. No. 11/948,662), all (or a substantial part) of the tube containing plasma is removed at the acceleration region, thereby allowing ions to be more rapidly accelerated in a relatively high magnetic field.

As shown in FIG. 10, the dee plate 100 is a hollow metal structure that has two semicircular surfaces 103, 105 that enclose a space 107 in which the protons are accelerated during half of their rotation around the space enclosed by the magnet structure. A duct 109 opening into the space 107 extends through the yoke to an external location from which a vacuum pump 111 can be attached to evacuate the space 107 and the rest of the space within a vacuum chamber 119 in which the acceleration takes place. The dummy dee 102 comprises a rectangular metal ring that is spaced near to the exposed rim of the dee plate. The dummy dee is grounded to the vacuum chamber and magnet yoke. The dee plate 100 is driven by a radio-frequency signal that is applied at the end of a radio-frequency transmission line to impart an electric field in the space 107. The radio frequency electric field is made to vary in time as the accelerated particle beam increases in distance from the geometric center. The radio frequency electric field may be controlled in the manner described in U.S. patent application Ser. No. 11/948,359, entitled “Matching A Resonant Frequency Of A Resonant Cavity To A Frequency Of An Input Voltage”, the contents of which are incorporated herein by reference.

For the beam emerging from the centrally located particle source to clear the particle source structure as it begins to spiral outward, a large voltage difference is required across the radio frequency plates. 20,000 Volts is applied across the radio frequency plates. In some versions from 8,000 to 20,000 Volts may be applied across the radio frequency plates. To reduce the power required to drive this large voltage, the magnet structure is arranged to reduce the capacitance between the radio frequency plates and ground. This is done by forming holes with sufficient clearance from the radio frequency structures through the outer yoke and the cryostat housing and making sufficient space between the magnet pole faces.

The high voltage alternating potential that drives the dee plate has a frequency that is swept downward during the accelerating cycle to account for the increasing relativistic mass of the protons and the decreasing magnetic field. The dummy dee does not require a hollow semi-cylindrical structure as it is at ground potential along with the vacuum chamber walls. Other plate arrangements could be used such as more than one pair of accelerating electrodes driven with different electrical phases or multiples of the fundamental frequency. The RF structure can be tuned to keep the Q high during the required frequency sweep by using, for example, a rotating capacitor having intermeshing rotating and stationary blades. During each meshing of the blades, the capacitance increases, thus lowering the resonant frequency of the RF structure. The blades can be shaped to create a precise frequency sweep required. A drive motor for the rotating condenser can be phase locked to the RF generator for precise control. One bunch of particles is accelerated during each meshing of the blades of the rotating condenser.

The vacuum chamber 119 in which the acceleration occurs is a generally cylindrical container that is thinner in the center and thicker at the rim. The vacuum chamber encloses the RF plates and the particle source and is evacuated by the vacuum pump 111. Maintaining a high vacuum insures that accelerating ions are not lost to collisions with gas molecules and enables the RF voltage to be kept at a higher level without arcing to ground.

Protons traverse a generally spiral orbital path beginning at the particle source. In half of each loop of the spiral path, the protons gain energy as they pass through the RF electric field in space 107. As the ions gain energy, the radius of the central orbit of each successive loop of their spiral path is larger than the prior loop until the loop radius reaches the maximum radius of the pole face. At that location a magnetic and electric field perturbation directs ions into an area where the magnetic field rapidly decreases, and the ions depart the area of the high magnetic field and are directed through an evacuated tube 38, referred to herein as the extraction channel, to exit the yoke of the cyclotron. A magnetic regenerator may be used to change the magnetic field perturbation to direct the ions. The ions exiting the cyclotron will tend to disperse as they enter the area of markedly decreased magnetic field that exists in the room around the cyclotron. Beam shaping elements 107, 109 in the extraction channel 38 redirect the ions so that they stay in a straight beam of limited spatial extent.

The magnetic field within the pole gap needs to have certain properties to maintain the beam within the evacuated chamber as it accelerates. The magnetic field index n, which is shown below,
n=−(r/B)dB/dr,
should be kept positive to maintain this “weak” focusing. Here r is the radius of the beam and B is the magnetic field. Additionally, in some implementations, the field index needs to be maintained below 0.2, because at this value the periodicity of radial oscillations and vertical oscillations of the beam coincide in a vr=2 vz resonance. The betatron frequencies are defined by vr=(1−n)1/2 and vz=n1/2. The ferromagnetic pole face is designed to shape the magnetic field generated by the coils so that the field index n is maintained positive and less than 0.2 in the smallest diameter consistent with a 250 MeV beam in the given magnetic field.

As the beam exits the extraction channel it is passed through a beam formation system 125 (FIG. 5) that can be programmably controlled to create a desired combination of scattering angle and range modulation for the beam. Beam formation system 125 may be used in conjunction with an inner gantry 601 (FIG. 14) to direct a beam to the patient.

During operation, the plates absorb energy from the applied radio frequency field as a result of conductive resistance along the surfaces of the plates. This energy appears as heat and is removed from the plates using water cooling lines 108 that release the heat in a heat exchanger 113 (FIG. 3).

Stray magnetic fields exiting from the cyclotron are limited by both the pillbox magnet yoke (which also serves as a shield) and a separate magnetic shield 114. The separate magnetic shield includes of a layer 117 of ferromagnetic material (e.g., steel or iron) that encloses the pillbox yoke, separated by a space 116. This configuration that includes a sandwich of a yoke, a space, and a shield achieves adequate shielding for a given leakage magnetic field at lower weight. In some implementations, the synchrocyclotron may have an active return system to reduce stray magnetic fields. An example of an active return system is described in U.S. patent application Ser. No. 13/907,601, which was filed on May 31, 2013, the contents of which are incorporated herein by reference.

As mentioned, the gantry allows the synchrocyclotron to be rotated about the horizontal rotational axis 532. The truss structure 516 has two generally parallel spans 580, 582. The synchrocyclotron is cradled between the spans about midway between the legs. The gantry is balanced for rotation about the bearings using counterweights 122, 124 mounted on ends of the legs opposite the truss.

The gantry is driven to rotate by an electric motor mounted to one or both of the gantry legs and connected to the bearing housings by drive gears . The rotational position of the gantry is derived from signals provided by shaft angle encoders incorporated into the gantry drive motors and the drive gears.

At the location at which the ion beam exits the cyclotron, the beam formation system 125 acts on the ion beam to give it properties suitable for patient treatment. For example, the beam may be spread and its depth of penetration varied to provide uniform radiation across a given target volume. The beam formation system can include passive scattering elements as well as active scanning elements.

All of the active systems of the synchrocyclotron (the current driven superconducting coils, the RF-driven plates, the vacuum pumps for the vacuum acceleration chamber and for the superconducting coil cooling chamber, the current driven particle source, the hydrogen gas source, and the RF plate coolers, for example), may be controlled by appropriate synchrocyclotron control electronics (not shown), which may include, e.g., one or more computers programmed with appropriate programs to effect control.

The control of the gantry, the patient support, the active beam shaping elements, and the synchrocyclotron to perform a therapy session is achieved by appropriate therapy control electronics (not shown).

As shown in FIGS. 1, 11, and 12, the gantry bearings are supported by the walls of a cyclotron vault 524. The gantry enables the cyclotron to be swung through a range 520 of 180 degrees (or more) including positions above, to the side of, and below the patient. The vault is tall enough to clear the gantry at the top and bottom extremes of its motion. A maze 146 sided by walls 148, 150 provides an entry and exit route for therapists and patients. Because at least one wall 152 is not in line with the proton beam directly from the cyclotron, it can be made relatively thin and still perform its shielding function. The other three side walls 154, 156, 150/148 of the room, which may need to be more heavily shielded, can be buried within an earthen hill (not shown). The required thickness of walls 154, 156, and 158 can be reduced, because the earth can itself provide some of the needed shielding.

Referring to FIGS. 12 and 13, for safety and aesthetic reasons, a therapy room 160 may be constructed within the vault. The therapy room is cantilevered from walls 154, 156, 150 and the base 162 of the containing room into the space between the gantry legs in a manner that clears the swinging gantry and also maximizes the extent of the floor space 164 of the therapy room. Periodic servicing of the accelerator can be accomplished in the space below the raised floor. When the accelerator is rotated to the down position on the gantry, full access to the accelerator is possible in a space separate from the treatment area. Power supplies, cooling equipment, vacuum pumps and other support equipment can be located under the raised floor in this separate space. Within the treatment room, the patient support 170 can be mounted in a variety of ways that permit the support to be raised and lowered and the patient to be rotated and moved to a variety of positions and orientations.

In system 602 of FIG. 14, a beam-producing particle accelerator of the type described herein, in this case synchrocyclotron 604, is mounted on rotating gantry 605. Rotating gantry 605 is of the type described herein, and can angularly rotate around patient support 606. This feature enables synchrocyclotron 604 to provide a particle beam directly to the patient from various angles. For example, as in FIG. 14, if synchrocyclotron 604 is above patient support 606, the particle beam may be directed downwards toward the patient. Alternatively, if synchrocyclotron 604 is below patient support 606, the particle beam may be directed upwards toward the patient. The particle beam is applied directly to the patient in the sense that an intermediary beam routing mechanism is not required. A routing mechanism, in this context, is different from a shaping or sizing mechanism in that a shaping or sizing mechanism does not re-route the beam, but rather sizes and/or shapes the beam while maintaining the same general trajectory of the beam.

Further details regarding an example implementation of the foregoing system may be found in U.S. Pat. No. 7,728,311, filed on Nov. 16, 2006 and entitled “Charged Particle Radiation Therapy”, and in U.S. patent application Ser. No. 12/275,103, filed on Nov. 20, 2008 and entitled “Inner Gantry”. The contents of U.S. Pat. No. 7,728,311 and in U.S. patent application Ser. No. 12/275,103 are incorporated herein by reference. In some implementations, the synchrocyclotron may be a variable-energy device, such as that described in U.S. patent application Ser. No. 13/916,401, filed on Jun. 12, 2013, the contents of which are incorporated herein by reference.

EXAMPLE IMPLEMENTATIONS

Referring to FIG. 15, an example control system 1500 may be used to control the example particle therapy system described above, e.g., with respect to FIGS. 1-14. The control system 155 may contain a Therapy Control Computer (TCC) 1502 that can include a user interface, a Master Control Computer (MCC) 1508 for processing machine instructions in real-time, and I/O modules 1510, 1522 that can send machine instructions to components of the particle accelerator.

In some examples, the TCC 1502 is networked to a hospital so the TCC 1502 can receive patent prescriptions 1504 from the hospital before treatment and send treatment records 1506 to the hospital after treatment. The TCC 1502 can also translate a received patient prescription 1504 into machine parameters that can be understood by a Master Control Computer (MCC) 1508.

The MCC 1508 can include a real-time operating system 1508a. A real-time operating system 1508a is an operating system that serves real-time requests. For example, a non-real-time operating systems may delay serving a request if it is busy doing something else.

The MCC 1508 can be configured to receive machine parameters from the TCC 1502. The MCC 1508 can translate the machine parameters into specific machine instructions that can be understood by one or more slow input/output modules 1510 and one or more fast input/output modules 1522, described in more detail below. The MCC 1508, with the aid of the real-time operating system 1508a, can send machine instructions to the slow 1510 and fast I/O modules 1522 at specified times in a specified order.

The slow I/O modules 1510 can be used to send machine instructions to aspects of the particle accelerator that do not require relatively fast transmission. In this context, “slow” refers to an operational speed that is less than a “fast” operational speed, and “fast refers to an operational speed that is greater than “slow” operational speed. The terms “slow” and “fast” are not intended to refer to, or to imply, any specific operational speeds and are relative terms, not absolute values.

In some examples, the slow I/O modules 1510 are programmable logic controllers with speeds in the order of milliseconds. For example, a machine instruction may take more than 1 ms to arrive at the particular component. Slow I/O modules 1510 can be configured to send machine instructions to one or more motor controllers 1530.

In some examples, the slow I/O modules 1510 send machine instructions to one or more motor controllers 1530. In an example, the motor controllers 1530 can control motors that are part of a field shaping wheel system 1512, a scatterer system 1514, a rotating capacitor system 1516, a modular wheel control system 1518, or a gantry control system 1520, although the motor controllers can be part of any system that uses a motor.

Referring to FIG. 16, an example field shaping wheel system 1512 can be used to shape the particle beam to a desired shape. The field shaping wheel system 1512 can include a wheel rack 1608, a wheel chamber 1612, wheels 1610, and wheel motors 1606a-c. Each wheel 1610 alters the shape of the magnetic field in a different way. An example slow I/O module 1510a can send machine instructions to motor controllers 1530a-c depending on which wheel 1610 is appropriate (e.g., based on the translated prescription). Each motor controller 1530a-c can control one wheel motor 1606a-c. Wheel motor 1606a can move the wheel rack 1608 side to side until the selected wheel 1610 is situated below the wheel chamber 1612. Once the selected wheel 1610 is horizontally aligned, wheel motor 1606b can move the wheel up into the wheel chamber 1612. Once the selected wheel 1610 is situated in the wheel chamber 1612, wheel motor 1606c can rotate it. Different rotational positions can have different effects on the shape of the magnetic field that the particle beam experiences.

As explained above, the beam formation system (125 of FIG. 5) can create a desired combination of scattering angle and range modulation for the particle beam. Referring to FIG. 17, the output particle beam 1704 may have a Gaussian profile (with a majority of particles at the center of the beam) after it passes through the extraction channel (and the modulator wheel, described below). A scatterer 1702a can reshape the particle beam so that the particle beam has a substantially constant width (w). For example, the particle beam may have a circular cross-section. In this implementation, scatterer 1702a is a scattering foil, all or part of which may be made of a metal, such as lead. As shown, scatterer 1702a has a side that is convex in shape, and includes more lead at its edges than at its center. To achieve a larger field beam size, thicker lead may be used, and vice versa. In this regard, the particle therapy system may include multiple scatterers 1702a-e, which may be switched into, or out of, the path of the particle beam in order to achieve a particle beam field size (cross-sectional area).

Different treatments require different scattering angles and range modulations. The scatterer system 1514 can be used to place the appropriate scatterer 1702a-e in the particle beam path. In an example, the scatterer system 1514 can include one or more motors 1706 configured to place different scatterers 1702a-e in the particle beam path in a way similar to the field shaping wheel system 1512. An example slow I/O module 1510b can send machine instructions to a motor controller 1530d depending on which scatterer 1702a-e is appropriate (e.g., based on the translated prescription). The motor controller 1530d can control the motor 1706 such that the motor 1706 places the appropriate scatterer 1702a-e in the beam formation system 125.

As explained above, a rotating capacitor can be used tune the RF structure during the frequency sweep. In an example, a rotating capacitor system 1516 can be configured to rotate some of the blades of the rotating capacitor to an appropriate position. The rotating capacitor system 1516 can include one or more motors that can control the rotating capacitor in a way similar to the field shaping wheel system 1512. An example slow I/O module 1510 can send machine instructions to motor controllers to rotate the capacitor at a fixed speed. An associated fast I/O system can coordinate the rotational speed of the modulator wheel with the rotational speed of the capacitor to insure the beam pulses from the synchrocyclotron are uniformly distributed on the modulator wheel azimuthally

As explained above, the gantry enables the particle accelerator to be rotated around a patient position. The gantry control system 1520 can be used to rotate the gantry into the appropriate position (e.g., to apply treatment at the desired angle). In an example, the gantry control system 1520 can include one or more motors configured to rotate the gantry to the appropriate position in a way similar to systems 1512, 1514, and 1516. An example slow I/O module 1510 can send machine instructions to motor controllers 1530 depending on what gantry position is appropriate (e.g., based on the translated prescription). The motor controllers 1530 can control the motors such that the motors rotate the gantry into the correct position.

Downstream from (e.g., after) the extraction channel, various devices are used to affect the particle beam output. One such device is configured to spread-out Bragg peaks of the particle beam to achieve a substantially uniform particle beam dose at a range of depths within the patient. As described in wikipedia.org, “[w]hen a fast charged particle moves through matter, it ionizes atoms of the material and deposits a dose along its path. A peak occurs because the interaction cross section increases as the charged particle's energy decreases.” “The Bragg peak is a pronounced peak on the Bragg curve which plots the energy loss of ionizing radiation during its travel through matter. For protons . . . the peak occurs immediately before the particles come to rest.” FIG. 18 is an example Bragg curve showing a Bragg peak 900 for a particular dose of proton therapy and depth.

To achieve a relatively uniform dose of particle therapy at a range of depths, a modulator device is configured to move Bragg peaks of the particle beam along the graph of FIG. 18 and to change the intensity of the Bragg peaks at the moved locations. Because particle therapy is cumulative, the resulting dosages may be added to obtain a substantially uniform dose. For example, referring to FIG. 18, the dosage at point 901 is the sum of doses at point 902 on Bragg curve 903, at point 904 on Bragg curve 905, and at point 906 on Bragg curve 907. Ideally, the result is a substantially uniform dose from depths 908a to 908b. This is referred to as a “spread-out Bragg peak”, which extends depth-wise into a patient.

In some implementations, the modulator device used to spread-out the Bragg peaks is a structure, such as a modulator wheel, having different thicknesses at different locations along its circumference. Accordingly, the modulator wheel is rotatable in the path of, and relative to, the particle beam in order to provide the appropriate amount of particle therapy for a particular depth and area.

FIG. 19 shows a perspective view of an example modulator wheel 910 and FIG. 20 shows a top view of modulator wheel 910. As shown in the figures, the modulator wheel 910 has numerous steps 911, each with a different thickness (e.g., varying from zero or substantially zero thickness to a thickness on the order of centimeters or more). The thicknesses are used to vary the depth of corresponding Bragg peaks. For example, the least amount of thickness produces a Bragg peak with the most depth, the greatest amount of thickness produces a Bragg peak with the least depth, and so forth. As shown in FIG. 20 the angles (e.g., 912, 913, etc.) of the various steps also vary, resulting in different circumferential lengths for at least some of, and in some cases all of, the steps. The angle of each step adjusts how much the corresponding Bragg peak subtends within the patient. For example, the Bragg peak with the most intensity (e.g., Bragg peak 900 of FIG. 18) is the one that subtends the most. Accordingly, its corresponding step 914 has the largest angular extent. The Bragg peak with the next most intensity (e.g., Bragg peak 904 of FIG. 18) is the one that subtends the next most. Accordingly, its corresponding step 915 has the next largest angular extent; and so forth.

The modulator wheel may have constant, substantially constant, or variable rotation in order to provide the appropriate Bragg peak spreading for a prescription. In some implementations, the particle therapy system may include more than one modulator wheel of the type shown in FIGS. 27 and 28. The modulator wheels may be switchable into, and out of, the beam path by a modulator wheel control system (1518 of FIG. 15) in order to achieve a desired particle beam dose at a particular patient depth. For example, a first modulator wheel may be used for a first depth or range of depths (e.g., 10 cm to 15 cm); a second modulator wheel may be used for a second depth or range of depths (e.g., 15 cm to 20 cm); a third modulator wheel may be used for a third depth or range of depths (e.g., 20 cm to 25 cm); and so forth. In some implementations, there may be twelve modulator wheels, each of which may be calibrated for a different depth range; however, in other implementations, more or less than twelve modulator wheels may be used. Treatment depth is also dependent upon the particle beam intensity, which is a function of the ion (or particle) source pulse width, as described below.

The modulator wheels may be designed to provide uniform spread-out Bragg peaks from a maximum depth to the surface of a patient (e.g., to the outer layer of the patient's skin). To customize the depth of dosage, Bragg peaks in undesired locations (e.g., in area 917 in FIG. 18) may be “turned-off”. This may be done by turning-off the RF source, turning-off the particle source, or turning-off both at an appropriate time during each rotation of the modulator wheel.

Particle source pulse width also has an effect on spread-out Bragg peak uniformity. As background, the amount of time that a particle source is intermittently (e.g., periodically) activated is varied, thereby providing the plasma column for different periods of time and enabling extraction of different numbers of particles. For example, if the pulse width is increased, the number of particles extracted increases and, if the pulse width decreases, the number of particles extracted decreases. In some implementations, there is a linear relationship between the time that the particle source is on and the intensity of the particle beam. For example, the relationship may be one-to-one plus an offset. In an example implementation, the particle source may be pulsed within a frequency window that occurs during a frequency sweep between a maximum frequency of about 135 MHz and a minimum frequency of about 95 MHz or 90 MHz. For example, the particle source may be pulsed between 132 MHz and 131 MHz for a period of time. In an implementation, this period of time is about 40 us; however, these values may vary or be different in other implementations. Failing to pulse the particle source outside of the frequency window can inhibit extraction of particles from the plasma column.

FIG. 21 is a graph showing the voltage sweep in the resonant cavity over time from a maximum frequency (e.g., 135 MHz) to a minimum frequency (e.g., 90 MHz or 95 MHz). The extraction window 920 occurs, in this example, between 132 MHz and 131 MHz. The width of pulse 921 (the particle source pulse width) may be varied (e.g., by controlling the “on” time of the particle source) to control the intensity of the particle beam output by the particle accelerator.

Particle source pulse widths may be adjustable in order to achieve substantial uniformity in spread-out Bragg peaks. In this regard, various factors, such as particle beam intensity, may contribute to the depth at which Bragg peaks penetrate a patient. A selected modulator wheel can produce different Bragg curves for different depths. For example, FIG. 22 shows Bragg curves for three different depths. Bragg curve 950 is for the nominal (or predefined) depth for a modulator wheel; Bragg curve 951 is for the maximum depth for the modulator wheel; and Bragg curve 952 is for the minimum depth for the modulator wheel. Ideally, the spread-out Bragg peaks should be at about the nominal level regardless of depth.

As shown in FIG. 22, Bragg curves 951 and 952 have spread-out Bragg peaks that are sloped. For Bragg curve 952, the slope is positive; and for Bragg curve 951 the slope is negative. To more closely approximate the nominal Bragg peak level at point b, the intensity of the particle beam is be increased at point a (to raise the Bragg peak at point a to the level at point b), and the intensity of the particle beam is be decreased at point c (to lower the Bragg peak at point c to the level of point b). The intensity of the particle beam is also be adjusted at points preceding a and c to either raise or lower the Bragg peaks at those points so that they coincide, at least to some degree, with the corresponding level of the nominal Bragg peak. The intensity of the particle beam may be changed by changing the particle source pulse width. However, different points along Bragg curves 951 and 952 require different amounts of adjustment in order to approximate the nominal spread-out Bragg peak of curve 950. Accordingly, in each instance, the pulse widths may be varied based on rotation of the modulator wheel. For example, at a point a when the modulator wheel impacts the particle beam, the pulse width may be increased more than at points preceding a along Bragg curve 951. Similarly, at a point c when the modulator wheel impacts the particle beam, the pulse width may be decreased more than at points preceding c along Bragg curve 952. For example, FIG. 23 is a plot showing the relationship between pulse width and rotational angle of the modulator wheel for Bragg curves 950, 951 and 952. Values have been omitted, since they are case specific.

Variations in pulse-width can be determined by obtaining the appropriate pulse widths at the beginning and ending of a Bragg peak, and linearly interpolating between the two to obtain variations in between. Other processes also may be used, as described below. To increase or decrease an overall dose, all pulse widths may be increased or decreased by a specified factor.

The modulator wheels may be switchable into, or out of, the beam path, as noted above. In an example, the modulator wheel control system (1518 of FIG. 15) can include one or more motors and a modulator wheel rack. An example slow I/O module 1510 can send machine instructions to motor controllers 1530 depending on which modulator wheel is appropriate (e.g., based on the translated prescription). Each motor controller 1530 can control a motor. For example, a motor can move the modulator wheel rack side to side until the selected modulator wheel is in position, and another motor can move the modulator wheel into, or out of, the beam path. In other implementations, the modulator wheel rack may be below the beam path, and an appropriate modulator wheel may be positioned proximate the beam path, and thereafter moved into the beam path by another motor.

Referring back to FIG. 15, a fast I/O module 1522 can be used to control components of the particle accelerator that require relatively fast transmission (e.g., the particle source 1524 and the RF voltage source). The fast I/O module can include a microprocessor 1522a for communicating with the real-time operating system 1508a of the MCC 1508, and a field-programmable gate array (FPGA) 1522b for sending and receiving information to/from the particle accelerator components. A modulator wheel communication line can also send information to the FPGA (1522b) pertaining to the modulator wheel. In an example, the modulator wheel communication line 1528 is an optical fiber 1528 that includes a sensor configured to monitor the modulator wheel.

As explained above, the modulator wheels may be configured to provide uniform spread-out Bragg peaks from a maximum depth to the surface of a patient (e.g., to the outer layer of the patient's skin). To affect the dosage, the particle source may be turned on and off at appropriates time during each rotation of the modulator wheel. This process is known as “pulse blanking”.

In some implementations, the particle source has a pulse frequency of about 500 pulses-per-second, with about 10 nano-amperes (nA) of current per-pulse. In other implementations, the number of pulses-per-second, and current per-pulse may be different than these numbers. In some implementations, a modulator wheel rotates such that each step of the modulator wheel (corresponding one of plural different thicknesses) receives multiple pulses on each step during rotation. The dosage for each step corresponds to the number of pulses received by that step.

The number of pulses applied to a target corresponds to the radiation dose at the target, and can have an effect on spread-out Bragg peak uniformity. More specifically, modulator wheels may be calibrated to provide dosage at specific tissue depths. For example, the thicknesses of wheel steps may be calibrated, based on an expected dose, to provide spread-out Bragg peaks over a range of depths, ideally to result in a uniform dose approximating something like that shown in FIG. 18. However, in practice, variations in tissues and materials (for example) may result in Bragg curves (i.e., depth dose distributions) that are non-uniform or that are sloped. FIG. 22, described above, shows examples of Bragg curves that are sloped, which could possibly result from such modulator wheels.

More specifically, as explained above, a selected modulator wheel can produce different Bragg curves for different tissue depths. For example, FIG. 22 shows Bragg curves for three different depths. Bragg curve 950 is for the nominal (or predefined) depth for a modulator wheel; Bragg curve 951 is for the maximum depth for the modulator wheel; and Bragg curve 952 is for the minimum depth for the modulator wheel. Ideally, the spread-out Bragg peaks should be at about the nominal level regardless of depth.

As shown in FIG. 22, Bragg curves 951 and 952 have spread-out Bragg peaks that are sloped. For Bragg curve 952, the slope is positive; and for Bragg curve 951 the slope is negative. To more closely approximate the nominal Bragg peak level at point b, the relative dosage of the particle beam (e.g., the number of pulses) may be increased at point a (to raise the Bragg peak at point a to the level at point b), and the relative dosage (e.g., the number of pulses) of the particle beam may be decreased at point c (to lower the Bragg peak at point c to the level of point b). The relative dosages of the particle beam may also be adjusted at points preceding a and c to either raise or lower the Bragg peaks at those points so that they coincide, at least to some degree, with the corresponding level of the nominal Bragg peak. In this regard, different points along Bragg curves 951 and 952 require different amounts of adjustment in order to approximate the nominal spread-out Bragg peak of curve 950. Accordingly, in each instance, the relative dosage (e.g., the number of pulses) may be varied based on, and corresponding to, rotation of the modulator wheel. For example, at a point a when the modulator wheel impacts the particle beam, the relative dosage (e.g., number of pulses) may be increased more than at points preceding a along Bragg curve 951. Similarly, at a point c when the modulator wheel impacts the particle beam, the relative dosage (e.g., number of pulses) may be decreased more than at points preceding c along Bragg curve 952. The dosage applications are analogous to FIG. 23, which is described above for pulse width variations

Variations in dosage to obtain uniform Bragg curves can be determined by obtaining the dosages at the beginning and ending of a Bragg peak, and linearly interpolating between the two to obtain variations in between. This information may be obtained as part of a calibration process. Other processes also may be used, as described below.

To increase or decrease an overall dose, the particle source and/or other feature(s) of the particle therapy system may be used to control the number of output pulses. For example, the particle source may be turned off to reduce the number of output of pulses to the modulator wheel, and the particle source may be turned on to increase the number of output pulse of the particle beam to the modulator wheel. This control may be performed at a certain step or steps (e.g., sectors) of the modulator wheel to obtain the desired result, e.g., increased or decreased dosage and, therefore, an increase or decrease in the slope of the corresponding Bragg curve. Dosage may also be applied or withheld to correct for holes or spikes in the Bragg curves. Control over the various aspects of the system may be performed by the slow and fast I/O modules described above. In other implementations, different control systems may be used.

As noted, in some implementations, the number of pulses may be varied by turning-on or turning-off the particle source at appropriate times during rotation of the modulator wheel. In some implementations, other features are used to control the number of pulses that are applied to particular sectors of the modulator wheel. For example, the RF voltage sweep may be interrupted intermittently, thereby reducing the number of pulses (since a pulse is typically output per sweep). To increase the number of pulses, the rate of the sweep may be increased. In another example, additional hardware may be used to control the number of pulses. For example, a steering mechanism, such as a kicker magnet, may be used to reduce the output of pulses for particular rotations of the modulator wheel. In some implementations, a kicker magnet (or other structure) may direct a set (e.g., every other, every third, and so forth) of pulses to an absorber material, thereby preventing their output to the irradiation target.

To obtain a flat, or substantially flat, Bragg curve, as explained herein it may be necessary to increase or decrease the relative number of pulses applied to particular sectors of a modulator wheel. The increase or decrease may be relative to amounts of pulses applied to other sectors of the modulator wheel. For example, a decrease in the number of pulses applied to all sectors of a modulator wheel but not to one sector has a similar effect as an increase in the number of pulses applied to that one sector of the modulator wheel. Such relative changes to the applied numbers of pulses may be used to obtain the appropriate increase and decreases to change a Bragg curve. In cases where the numbers of pulses have been decreased to obtain a relative increase in one sector, the overall dose applied may be reduced. In those situations, the particle therapy system may require a longer irradiation time to achieve the required overall dosage for a particular target.

In some implementations, the particle therapy system may include a scanning system to scan the particle beam across a cross-section of an irradiation target. This is done at different depths to treat the entire irradiation target. In implementations that involve scanning, pulse blanking of the type described herein may be used on a spot-by-spot basis. That is, during scanning, a particle beam is applied at a spot, then the particle beam is moved (typically by a magnet) to a next spot on the irradiation target. Pulse blanking may be used to control the number of pulses applied to each spot. Generally, spot scanning involves applying irradiation at discrete spots on an irradiation target and raster scanning involves moving a radiation spot across the radiation target. The concept of spot size therefore applies for both raster and spot scanning.

Referring back to FIG. 19, the example modulator wheel 910 may have multiple markings 916 around its edge. The markings 916 can be any shape and can have any configuration. Particular markings 916 can signify particular modulator wheel 910 positions. In an example, the exact position of the modulator wheel 910 can be determined by identifying the markings 916. In another example, the markings 916 are configured such that the rotational speed of the modulator wheel 910 can be determined by only looking at the markings 916.

A first end of the optical fiber 1528 (e.g., the end that includes the sensor) can be situated in a position where it can detect the markings 916 on the modulator wheel 910. A second end of the optical fiber 1528 can be connected to the FPGA 1522b and be configured to communicate information pertaining to the modulator wheel 910 (e.g., its position and rotational speed).

The FPGA 1522b may also be configured to send and receive information from the particle source 1524 and the RF voltage source 1526. As explained above, the depth of dosage (e.g., based on the translated prescription) can be customized by “turning-off” Bragg peaks in undesired locations (e.g., in area 917 in FIG. 18). This may be done by turning-off the RF source, turning-off the particle source, or turning-off both at an appropriate time during each rotation of the modulator wheel 910. The FPGA 1522b can communicate the information the FPGA 1522b receives from the optical fiber 1528 to the microprocessor 1522a (which in turn communicated with the real-time operating system 1508a of the MCC 1508) and receive instructions from the microprocessor 1522a regarding particle source 1524 and RF voltage source 1526 control. For example, the FPGA 1522b may tell the particle source 1524 and/or the RF voltage source 1526 to turn on/off when the modulator wheel 910 is in a particular position or positions. The FPGA 1522b may also tell the particle source 1524 how long to make the particle source pulse widths based on the rotational position of the modulator wheel.

As mentioned above, the fast I/O module 1522 can also receive information from the particle source 1524 and the RF voltage source 1526. A fast I/O module 1522 is desirable for controlling these components because their operation is time sensitive. Referring back to FIG. 21, the extraction window 920 is created by pulsing the particle source over a particular frequency range. In some examples, this frequency range is very small (e.g., less than a 1 MHz window). The fast I/O module 1522 can also receive information from the RF voltage source 1526 and the particle source 1524 in addition to the information it receives about the modulator wheel 910. The RF voltage source 1526 can continuously communicate its frequency to the fast I/O module 1522. The fast I/O module can then tell the particle source 1524 to turn on when it learns that the RF voltage source is at a particular frequency or the modulator wheel is at a particular location, and to turn off when it learns that the RF voltage source is at a particular frequency or the modulator wheel is at a particular location. The fast I/O module 1522 can also use received information (e.g., the rotational position of the modulator wheel) to tell the particle source 1524 how long to make the particle source pulse widths.

Aspects of the control system are system specific and may vary depending on the type of treatment (e.g., the prescription).

Elements of different implementations described herein may be combined to form other implementations not specifically set forth above. Elements may be left out of the processes, systems, apparatus, etc., described herein without adversely affecting their operation. Various separate elements may be combined into one or more individual elements to perform the functions described herein.

The example implementations described herein are not limited to use with a particle therapy system or to use with the example particle therapy systems described herein. Rather, the example implementations can be used in any appropriate system that directs accelerated particles to an output.

Additional information concerning the design of an example implementation of a particle accelerator that may be used in a system as described herein can be found in U.S. Provisional Application No. 60/760,788, entitled “High-Field Superconducting Synchrocyclotron” and filed Jan. 20, 2006; U.S. patent application Ser. No. 11/463,402, entitled “Magnet Structure For Particle Acceleration” and filed Aug. 9, 2006; and U.S. Provisional Application No. 60/850,565, entitled “Cryogenic Vacuum Break Pneumatic Thermal Coupler” and filed Oct. 10, 2006, all of which are incorporated herein by reference.

The following applications, all of which are filed on the same date as the subject application (entitled “CONTROL SYSTEM FOR A PARTICLE ACCELERATOR” (Application No. 61/707,645)), are incorporated by reference into the subject application: the U.S. Provisional Application entitled “CONTROLLING INTENSITY OF A PARTICLE BEAM” (Application No. 61/707,466 filed on Sep. 29, 2012), the U.S. Provisional Application entitled “ADJUSTING ENERGY OF A PARTICLE BEAM” (Application No. 61/707,515, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “ADJUSTING COIL POSITION” (Application No. 61/707,548, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “FOCUSING A PARTICLE BEAM USING MAGNETIC FIELD FLUTTER” (Application No. 61/707,572, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “MAGNETIC FIELD REGENERATOR” (Application No. 61/707,590, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “FOCUSING A PARTICLE BEAM” (Application No. 61/707,704, filed on Sep. 28, 2012), and the U.S. Provisional Application entitled “CONTROLLING PARTICLE THERAPY (Application No. 61/707,624, filed on Sep. 28, 2012).

The following are also incorporated by reference into the subject application: U.S. Pat. No. 7,728,311 which issued on Jun. 1, 2010, U.S. patent application Ser. No. 11/948,359 which was filed on Nov. 30, 2007, U.S. patent application Ser. No. 12/275,103 which was filed on Nov. 20, 2008, U.S. patent application Ser. No. 11/948,662 which was filed on Nov. 30, 2007, U.S. Provisional Application No. 60/991,454 which was filed on Nov. 30, 2007, U.S. Pat. No. 8,003,964 which issued on Aug. 23, 2011, U.S. Pat. No. 7,208,748 which issued on Apr. 24, 2007, U.S. Pat. No. 7,402,963 which issued on Jul. 22, 2008, U.S. patent application Ser. No. 13/148,000 filed Feb. 9, 2010, U.S. patent application Ser. No. 11/937,573 filed on Nov. 9, 2007, U.S. patent application Ser. No. 11/187,633, titled “A Programmable Radio Frequency Waveform Generator for a Synchrocyclotron,” filed Jul. 21, 2005, U.S. Provisional Application No. 60/590,089, filed on Jul. 21, 2004, U.S. patent application Ser. No. 10/949,734, titled “A Programmable Particle Scatterer for Radiation Therapy Beam Formation”, filed Sep. 24, 2004, and U.S. Provisional Application No. 60/590,088, filed Jul. 21, 2005.

Any features of the subject application may be combined with one or more appropriate features of the following: the U.S. Provisional Application entitled “CONTROLLING INTENSITY OF A PARTICLE BEAM” (Application No. 61/707,466 filed on Sep. 29, 2012), the U.S. Provisional Application entitled “ADJUSTING ENERGY OF A PARTICLE BEAM” (Application No. 61/707,515, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “ADJUSTING COIL POSITION” (Application No. 61/707,548, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “FOCUSING A PARTICLE BEAM USING MAGNETIC FIELD FLUTTER” (Application No. 61/707,572, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “MAGNETIC FIELD REGENERATOR” (Application No. 61/707,590, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “FOCUSING A PARTICLE BEAM” (Application No. 61/707,704, filed on Sep. 28, 2012), the U.S. Provisional Application entitled “CONTROLLING PARTICLE THERAPY (Application No. 61/707,624, filed on Sep. 28, 2012), U.S. Pat. No. 7,728,311 which issued on Jun. 1, 2010, U.S. patent application Ser. No. 11/948,359 which was filed on Nov. 30, 2007, U.S. patent application Ser. No. 12/275,103 which was filed on Nov. 20, 2008, U.S. patent application Ser. No. 11/948,662 which was filed on Nov. 30, 2007, U.S. Provisional Application No. 60/991,454 which was filed on Nov. 30, 2007, U.S. patent application Ser. No. 13/907,601, which was filed on May 31, 2013, U.S. patent application Ser. No. 13/916,401, filed on Jun. 12, 2013, U.S. Pat. No. 8,003,964 which issued on Aug. 23, 2011, U.S. Pat. No. 7,208,748 which issued on Apr. 24, 2007, U.S. Pat. No. 7,402,963 which issued on Jul. 22, 2008, U.S. patent application Ser. No. 13/148,000 filed Feb. 9, 2010, U.S. patent application Ser. No. 11/937,573 filed on Nov. 9, 2007, U.S. patent application Ser. No. 11/187,633, titled “A Programmable Radio Frequency Waveform Generator for a Synchrocyclotron,” filed Jul. 21, 2005, U.S. Provisional Application No. 60/590,089, filed on Jul. 21, 2004, U.S. patent application Ser. No. 10/949,734, titled “A Programmable Particle Scatterer for Radiation Therapy Beam Formation”, filed Sep. 24, 2004, and U.S. Provisional Application No. 60/590,088, filed Jul. 21, 2005.

Except for the provisional application from which this patent application claims priority and the documents incorporated by reference above, no other documents are incorporated by reference into this patent application.

Other implementations not specifically described herein are also within the scope of the following claims.

Claims

1. A particle therapy system comprising:

a particle accelerator to output a particle beam, comprising: a particle source to provide pulses of ionized plasma to a cavity, each pulse of the particle source having a pulse width corresponding to a duration of operation of the particle source to produce the corresponding pulse, the particle beam being based on the pulses of ionized plasma; and a modulator wheel having different thicknesses, each thickness extending across a different circumferential length of the modulator wheel, the modulator wheel being arranged to receive a precursor to the particle beam and configured to create a spread-out Bragg peak for the particle beam;
one or more first input/output (I/O) modules operable at a first speed, the one or more first I/O modules being configured to send machine instructions to one or more motor controllers, at least one motor controller for controlling the modulator wheel;
one or more second I/O modules operable at a second speed that is greater than the first speed, at least one of the second I/O modules being configured to send machine instructions to the particle source so that pulse widths of the particle source vary with rotational positions of the modulator wheel.

2. The particle therapy system of claim 1, further comprising;

a therapy control computer programmed to receive prescription information from a hospital, to translate the prescription information to machine information, and to send treatment records to the hospital; and
a master control computer having a real-time operating system, the master control computer programmed to receive machine information from the therapy control computer, to translate the machine information into machine instructions, and send the machine instructions to one or more of the first I/O modules and the second I/O modules.

3. The particle therapy system of claim 2, further comprising an optical fiber over which is monitored a rotational speed and position of the modulator wheel.

4. The particle therapy system of claim 1, wherein the first I/O modules comprise programmable logic controllers (PLC).

5. The particle therapy system of claim 4, wherein at least one of the PLCs is programmed to send machine instructions to motor controllers for controlling a field shaping wheel system for shaping the particle beam prior to output.

6. The particle therapy system of claim 4, wherein at least one of the PLCs is programmed to send machine instructions to a motor controller for controlling a scattering system for collimating the particle beam prior to output.

7. The particle therapy system of claim 4, further comprising:

a radio frequency (RF) system to sweep RF frequencies through the cavity to extract particles from a plasma column produced by the particle source, the RF system comprising a rotating capacitor;
wherein at least one of the PLCs is programmed to send machine instructions to a motor controller that controls the rotating capacitor.

8. The particle therapy system of claim 1, wherein a speed of the first I/O modules is on the order of milliseconds and a speed of the second I/O modules is on the order of one or more hundreds of nanoseconds.

9. The particle therapy system of claim 4, further comprising:

a rotatable gantry on which the particle accelerator is mounted;
wherein at least one of the PLCs is programmed to send machine instructions to a motor controller that controls the rotatable gantry.

10. The particle therapy system of claim 4, wherein two or more of the PLCs are configured to communicate with one another.

11. The particle therapy system of claim 1, wherein the second I/O modules comprise field-programmable gate arrays (FPGA).

12. The particle therapy system of claim 11, further comprising:

a circuit board comprising a microprocessor;
at least one of the FPGAs being on the circuit board and in communication with the microprocessor;
wherein the microprocessor is programmed to communicate with a control computer.

13. The particle therapy system of claim 11, further comprising:

a radio frequency (RF) system to sweep RF frequencies through the cavity to extract particles from a plasma column produced by the particle source;
wherein at least one of the FPGAs comprises an RF control module, the RF control module being configured to receive information about a rotation of the modulator wheel and, based thereon, to coordinate operational aspects of the particle source and the RF system.

14. The particle therapy system of claim 13, wherein coordinating operational aspects of the particle source and the RF system comprises turning the particle source on or off based on a rotational position of the modulator wheel, and turning the RF system on or off based on a rotational position of the modulator wheel.

15. The particle therapy system of claim 14, wherein the RF control module is further configured to send machine instruction to the particle source to turn-on when an RF voltage is at a certain frequency and to turn-off when the RF voltage is at a certain frequency.

16. The control system of claim 14, wherein coordinating operational aspects of the particle source comprises specifying pulse widths during turn-on times of the particle source.

17. A particle therapy system comprising:

a particle accelerator to output a particle beam, comprising: a particle source to provide pulses of ionized plasma to a cavity, each pulse of the particle source having a pulse width corresponding to a duration of operation of the particle source to produce the corresponding pulse, the particle beam being based on the pulses of ionized plasma; and a modulator wheel having different thicknesses, each thickness extending across a different circumferential length of the modulator wheel, the modulator wheel being arranged to receive a precursor to the particle beam and being configured to create a spread-out Bragg peak for the particle beam;
wherein the particle therapy system is configured so that pulse widths of the particle source vary with rotational positions of the modulator wheel.
Referenced Cited
U.S. Patent Documents
2280606 April 1942 Van et al.
2492324 December 1949 Salisbury
2615129 October 1952 McMillan
2616042 October 1952 Weeks
2659000 November 1953 Salisbury
2701304 February 1955 Dickinson
2789222 April 1957 Martin
3175131 March 1965 Burleigh et al.
3432721 March 1969 Naydan et al.
3582650 June 1971 Avery
3679899 July 1972 Dimeff
3689847 September 1972 Verster
3757118 September 1973 Hodge et al.
3868522 February 1975 Bigham et al.
3886367 May 1975 Castle
3925676 December 1975 Bigham et al.
2958327 May 1976 Marancik et al.
3955089 May 4, 1976 McIntyre et al.
3958327 May 25, 1976 Marancik et al.
3992625 November 16, 1976 Schmidt et al.
4038622 July 26, 1977 Purcell
4047068 September 6, 1977 Ress et al.
4112306 September 5, 1978 Nunan
4129784 December 12, 1978 Tschunt et al.
4139777 February 13, 1979 Rautenbach
4197510 April 8, 1980 Szu
4220866 September 2, 1980 Symmons et al.
4230129 October 28, 1980 LeVeen
4256966 March 17, 1981 Heinz
4293772 October 6, 1981 Stieber
4336505 June 22, 1982 Meyer
4342060 July 27, 1982 Gibson
4345210 August 17, 1982 Tran
4353033 October 5, 1982 Karasawa
4425506 January 10, 1984 Brown et al.
4490616 December 25, 1984 Cipollina et al.
4507614 March 26, 1985 Prono et al.
4507616 March 26, 1985 Blosser et al.
4589126 May 13, 1986 Augustsson et al.
4598208 July 1, 1986 Brunelli et al.
4628523 December 9, 1986 Heflin
4633125 December 30, 1986 Blosser et al.
4641057 February 3, 1987 Blosser et al.
4641104 February 3, 1987 Blosser et al.
4651007 March 17, 1987 Perusek et al.
4680565 July 14, 1987 Jahnke
4705955 November 10, 1987 Mileikowsky
4710722 December 1, 1987 Jahnke
4726046 February 16, 1988 Nunan
4734653 March 29, 1988 Jahnke
4737727 April 12, 1988 Yamada et al.
4739173 April 19, 1988 Blosser et al.
4745367 May 17, 1988 Dustmann et al.
4754147 June 28, 1988 Maughan et al.
4763483 August 16, 1988 Olsen
4767930 August 30, 1988 Stieber et al.
4769623 September 6, 1988 Marsing et al.
4771208 September 13, 1988 Jongen et al.
4783634 November 8, 1988 Yamamoto et al.
4808941 February 28, 1989 Marsing
4812658 March 14, 1989 Koehler
4843333 June 27, 1989 Marsing et al.
4845371 July 4, 1989 Stieber
4865284 September 12, 1989 Gosis et al.
4868843 September 19, 1989 Nunan
4868844 September 19, 1989 Nunan
4870287 September 26, 1989 Cole et al.
4880985 November 14, 1989 Jones
4894541 January 16, 1990 Ono
4896206 January 23, 1990 Denham
4902993 February 20, 1990 Krevet
4904949 February 27, 1990 Wilson
4905267 February 27, 1990 Miller et al.
4917344 April 17, 1990 Prechter et al.
4943781 July 24, 1990 Wilson et al.
4945478 July 31, 1990 Merickel et al.
4968915 November 6, 1990 Wilson et al.
4987309 January 22, 1991 Klasen et al.
4992744 February 12, 1991 Fujita et al.
4996496 February 26, 1991 Kitamura et al.
5006759 April 9, 1991 Krispel
5010562 April 23, 1991 Hernandez et al.
5012111 April 30, 1991 Ueda
5017789 May 21, 1991 Young et al.
5017882 May 21, 1991 Finlan
5036290 July 30, 1991 Sonobe et al.
5039057 August 13, 1991 Prechter et al.
5039867 August 13, 1991 Nishihara et al.
5046078 September 3, 1991 Hernandez et al.
5072123 December 10, 1991 Johnsen
5111042 May 5, 1992 Sullivan et al.
5111173 May 5, 1992 Matsuda et al.
5117194 May 26, 1992 Nakanishi et al.
5117212 May 26, 1992 Yamamoto et al.
5117829 June 2, 1992 Miller et al.
5148032 September 15, 1992 Hernandez
5166531 November 24, 1992 Huntzinger
5189687 February 23, 1993 Bova et al.
5191706 March 9, 1993 Cosden
5240218 August 31, 1993 Dye
5260579 November 9, 1993 Yasuda et al.
5260581 November 9, 1993 Lesyna et al.
5278533 January 11, 1994 Kawaguchi
5285166 February 8, 1994 Hiramoto et al.
5317164 May 31, 1994 Kurokawa
5336891 August 9, 1994 Crewe
5341104 August 23, 1994 Anton et al.
5349198 September 20, 1994 Takanaka
5365742 November 22, 1994 Boffito et al.
5374913 December 20, 1994 Pissantezky et al.
5382914 January 17, 1995 Hamm et al.
5401973 March 28, 1995 McKeown et al.
5405235 April 11, 1995 Lebre et al.
5434420 July 18, 1995 McKeown et al.
5440133 August 8, 1995 Moyers et al.
5451794 September 19, 1995 McKeown et al.
5461773 October 31, 1995 Kawaguchi
5463291 October 31, 1995 Carroll et al.
5464411 November 7, 1995 Schulte et al.
5492922 February 20, 1996 Palkowitz
5511549 April 30, 1996 Legg et al.
5521469 May 28, 1996 Laisne
5538942 July 23, 1996 Koyama et al.
5549616 August 27, 1996 Schulte et al.
5561697 October 1, 1996 Takafuji et al.
5585642 December 17, 1996 Britton et al.
5633747 May 27, 1997 Nikoonahad
5635721 June 3, 1997 Bardi et al.
5668371 September 16, 1997 Deasy et al.
5672878 September 30, 1997 Yao
5691679 November 25, 1997 Ackermann et al.
5726448 March 10, 1998 Smith et al.
5727554 March 17, 1998 Kalend et al.
5730745 March 24, 1998 Schulte et al.
5751781 May 12, 1998 Brown et al.
5778047 July 7, 1998 Mansfield et al.
5783914 July 21, 1998 Hiramoto et al.
5784431 July 21, 1998 Kalend et al.
5797924 August 25, 1998 Schulte et al.
5811944 September 22, 1998 Sampayan et al.
5818058 October 6, 1998 Nakanishi et al.
5821705 October 13, 1998 Caporaso et al.
5825845 October 20, 1998 Blair et al.
5841237 November 24, 1998 Alton
5846043 December 8, 1998 Spath
5851182 December 22, 1998 Sahadevan
5866912 February 2, 1999 Slater et al.
5874811 February 23, 1999 Finlan et al.
5895926 April 20, 1999 Britton et al.
5920601 July 6, 1999 Nigg et al.
5929458 July 27, 1999 Nemezawa et al.
5963615 October 5, 1999 Egley et al.
5993373 November 30, 1999 Nonaka et al.
6008499 December 28, 1999 Hiramoto et al.
6034377 March 7, 2000 Pu
6057655 May 2, 2000 Jongen
6061426 May 9, 2000 Linders et al.
6064807 May 16, 2000 Arai et al.
6066851 May 23, 2000 Madono et al.
6080992 June 27, 2000 Nonaka et al.
6087670 July 11, 2000 Hiramoto et al.
6094760 August 1, 2000 Nonaka et al.
6118848 September 12, 2000 Reiffel
6140021 October 31, 2000 Nakasuji et al.
6144875 November 7, 2000 Schweikard et al.
6158708 December 12, 2000 Egley et al.
6207952 March 27, 2001 Kan et al.
6219403 April 17, 2001 Nishihara
6222905 April 24, 2001 Yoda et al.
6241671 June 5, 2001 Ritter et al.
6246066 June 12, 2001 Yuehu
6256591 July 3, 2001 Yoda et al.
6265837 July 24, 2001 Akiyama et al.
6268610 July 31, 2001 Pu
6278239 August 21, 2001 Caporaso et al.
6279579 August 28, 2001 Riaziat et al.
6307914 October 23, 2001 Kunieda et al.
6316776 November 13, 2001 Hiramoto et al.
6366021 April 2, 2002 Meddaugh et al.
6369585 April 9, 2002 Yao
6380545 April 30, 2002 Yan
6407505 June 18, 2002 Bertsche
6417634 July 9, 2002 Bergstrom
6433336 August 13, 2002 Jongen et al.
6433349 August 13, 2002 Akiyama et al.
6433494 August 13, 2002 Kulish et al.
6441569 August 27, 2002 Janzow
6443349 September 3, 2002 Van Der Burg
6465957 October 15, 2002 Whitham et al.
6472834 October 29, 2002 Hiramoto et al.
6476403 November 5, 2002 Dolinskii et al.
6492922 December 10, 2002 New
6493424 December 10, 2002 Whitham
6498444 December 24, 2002 Hanna et al.
6501981 December 31, 2002 Schweikard et al.
6519316 February 11, 2003 Collins
6593696 July 15, 2003 Ding et al.
6594336 July 15, 2003 Nishizawa et al.
6600164 July 29, 2003 Badura et al.
6617598 September 9, 2003 Matsuda
6621889 September 16, 2003 Mostafavi
6639234 October 28, 2003 Badura et al.
6646383 November 11, 2003 Bertsche et al.
6670618 December 30, 2003 Hartmann et al.
6683318 January 27, 2004 Haberer et al.
6683426 January 27, 2004 Kleeven
6693283 February 17, 2004 Eickhoff et al.
6710362 March 23, 2004 Kraft et al.
6713773 March 30, 2004 Lyons et al.
6713976 March 30, 2004 Zumoto et al.
6717162 April 6, 2004 Jongen
6736831 May 18, 2004 Hartmann et al.
6745072 June 1, 2004 Badura et al.
6769806 August 3, 2004 Moyers
6774383 August 10, 2004 Norimine et al.
6777689 August 17, 2004 Nelson
6777700 August 17, 2004 Yanagisawa et al.
6780149 August 24, 2004 Schulte
6799068 September 28, 2004 Hartmann et al.
6800866 October 5, 2004 Amemiya et al.
6803591 October 12, 2004 Muramatsu et al.
6814694 November 9, 2004 Pedroni
6822244 November 23, 2004 Beloussov et al.
6853142 February 8, 2005 Chistyakov
6853703 February 8, 2005 Svatos et al.
6864770 March 8, 2005 Nemoto et al.
6865254 March 8, 2005 Nafstadius
6873123 March 29, 2005 Marchand et al.
6891177 May 10, 2005 Kraft et al.
6891924 May 10, 2005 Yoda et al.
6894300 May 17, 2005 Reimoser et al.
6897451 May 24, 2005 Kaercher et al.
6914396 July 5, 2005 Symons et al.
6936832 August 30, 2005 Norimine et al.
6953943 October 11, 2005 Yanagisawa et al.
6965116 November 15, 2005 Wagner et al.
6969194 November 29, 2005 Nafstadius
6979832 December 27, 2005 Yanagisawa et al.
6984835 January 10, 2006 Harada
6992312 January 31, 2006 Yanagisawa et al.
6993112 January 31, 2006 Hesse
7008105 March 7, 2006 Amann et al.
7011447 March 14, 2006 Moyers
7012267 March 14, 2006 Moriyama et al.
7014361 March 21, 2006 Ein-Gal
7026636 April 11, 2006 Yanagisawa et al.
7038403 May 2, 2006 Mastrangeli et al.
7041479 May 9, 2006 Swartz et al.
7045781 May 16, 2006 Adamec et al.
7049613 May 23, 2006 Yanagisawa et al.
7053389 May 30, 2006 Yanagisawa et al.
7054801 May 30, 2006 Sakamoto et al.
7060997 June 13, 2006 Norimine et al.
7071479 July 4, 2006 Yanagisawa et al.
7073508 July 11, 2006 Moyers
7081619 July 25, 2006 Bashkirov et al.
7084410 August 1, 2006 Beloussov et al.
7091478 August 15, 2006 Haberer
7102144 September 5, 2006 Matsuda et al.
7122811 October 17, 2006 Matsuda et al.
7122966 October 17, 2006 Norling et al.
7122978 October 17, 2006 Nakanishi et al.
7135678 November 14, 2006 Wang et al.
7138771 November 21, 2006 Bechthold et al.
7154107 December 26, 2006 Yanagisawa et al.
7154108 December 26, 2006 Tadokoro et al.
7154991 December 26, 2006 Earnst et al.
7162005 January 9, 2007 Bjorkholm
7173264 February 6, 2007 Moriyama et al.
7173265 February 6, 2007 Miller et al.
7173385 February 6, 2007 Caporasco et al.
7186991 March 6, 2007 Kato et al.
7193227 March 20, 2007 Hiramoto et al.
7199382 April 3, 2007 Rigney et al.
7208748 April 24, 2007 Sliski et al.
7212608 May 1, 2007 Nagamine et al.
7212609 May 1, 2007 Nagamine et al.
7221733 May 22, 2007 Takai et al.
7227161 June 5, 2007 Matsuda et al.
7247869 July 24, 2007 Tadokoro et al.
7257191 August 14, 2007 Sommer
7259529 August 21, 2007 Tanaka
7262424 August 28, 2007 Moriyama et al.
7262565 August 28, 2007 Fujisawa
7274018 September 25, 2007 Adamec et al.
7280633 October 9, 2007 Cheng et al.
7295649 November 13, 2007 Johnsen
7297967 November 20, 2007 Yanagisawa et al.
7301162 November 27, 2007 Matsuda et al.
7307264 December 11, 2007 Brusasco et al.
7318805 January 15, 2008 Schweikard et al.
7319231 January 15, 2008 Moriyama et al.
7319336 January 15, 2008 Baur et al.
7331713 February 19, 2008 Moyers
7332880 February 19, 2008 Ina et al.
7345291 March 18, 2008 Kats
7345292 March 18, 2008 Moriyama et al.
7348557 March 25, 2008 Armit
7348579 March 25, 2008 Pedroni
7351988 April 1, 2008 Naumann et al.
7355189 April 8, 2008 Yanagisawa et al.
7368740 May 6, 2008 Beloussov et al.
7372053 May 13, 2008 Yamashita et al.
7378672 May 27, 2008 Harada
7381979 June 3, 2008 Yamashita et al.
7397054 July 8, 2008 Natori et al.
7397901 July 8, 2008 Johnsen
7398309 July 8, 2008 Baumann et al.
7402822 July 22, 2008 Guertin et al.
7402823 July 22, 2008 Guertin et al.
7402824 July 22, 2008 Guertin et al.
7402963 July 22, 2008 Sliski
7405407 July 29, 2008 Hiramoto et al.
7425717 September 16, 2008 Matsuda et al.
7432516 October 7, 2008 Peggs et al.
7439528 October 21, 2008 Nishiuchi et al.
7446328 November 4, 2008 Rigney et al.
7446490 November 4, 2008 Jongen et al.
7449701 November 11, 2008 Fujimaki et al.
7453076 November 18, 2008 Welch et al.
7465944 December 16, 2008 Ueno et al.
7466085 December 16, 2008 Nutt
7468506 December 23, 2008 Rogers et al.
7473913 January 6, 2009 Hermann et al.
7476867 January 13, 2009 Fritsch et al.
7476883 January 13, 2009 Nutt
7482606 January 27, 2009 Groezinger et al.
7492556 February 17, 2009 Atkins et al.
7507975 March 24, 2009 Mohr
7525104 April 28, 2009 Harada
7541905 June 2, 2009 Antaya
7547901 June 16, 2009 Guertin et al.
7554096 June 30, 2009 Ward et al.
7554097 June 30, 2009 Ward et al.
7555103 June 30, 2009 Johnsen
7557358 July 7, 2009 Ward et al.
7557359 July 7, 2009 Ward et al.
7557360 July 7, 2009 Ward et al.
7557361 July 7, 2009 Ward et al.
7560715 July 14, 2009 Pedroni
7560717 July 14, 2009 Matsuda et al.
7567694 July 28, 2009 Lu et al.
7574251 August 11, 2009 Lu et al.
7576499 August 18, 2009 Caporaso et al.
7579603 August 25, 2009 Birgy et al.
7579610 August 25, 2009 Grozinger et al.
7582866 September 1, 2009 Furuhashi et al.
7582885 September 1, 2009 Katagiri et al.
7582886 September 1, 2009 Trbojevic
7586112 September 8, 2009 Chiba et al.
7598497 October 6, 2009 Yamamoto et al.
7609009 October 27, 2009 Tanaka et al.
7609809 October 27, 2009 Kapatoes et al.
7609811 October 27, 2009 Siljamaki et al.
7615942 November 10, 2009 Sanders et al.
7626347 December 1, 2009 Sliski
7629598 December 8, 2009 Harada
7639853 December 29, 2009 Olivera et al.
7639854 December 29, 2009 Schnarr et al.
7643661 January 5, 2010 Ruchala et al.
7656258 February 2, 2010 Antaya et al.
7659521 February 9, 2010 Pedroni
7659528 February 9, 2010 Uematsu
7668291 February 23, 2010 Nord et al.
7672429 March 2, 2010 Urano et al.
7679073 March 16, 2010 Urano et al.
7682078 March 23, 2010 Rietzel
7692166 April 6, 2010 Muraki et al.
7692168 April 6, 2010 Moriyama et al.
7696499 April 13, 2010 Miller et al.
7696847 April 13, 2010 Antaya
7701677 April 20, 2010 Schultz et al.
7709818 May 4, 2010 Matsuda et al.
7710051 May 4, 2010 Caporaso et al.
7718982 May 18, 2010 Sliski et al.
7728311 June 1, 2010 Gall
7746978 June 29, 2010 Cheng et al.
7755305 July 13, 2010 Umezawa et al.
7759642 July 20, 2010 Nir
7763867 July 27, 2010 Birgy et al.
7767988 August 3, 2010 Kaiser et al.
7770231 August 3, 2010 Prater et al.
7772577 August 10, 2010 Saito et al.
7773723 August 10, 2010 Nord et al.
7773788 August 10, 2010 Lu et al.
7778488 August 17, 2010 Nord et al.
7783010 August 24, 2010 Clayton
7784127 August 31, 2010 Kuro et al.
7786451 August 31, 2010 Ward et al.
7786452 August 31, 2010 Ward et al.
7789560 September 7, 2010 Moyers
7791051 September 7, 2010 Beloussov et al.
7796731 September 14, 2010 Nord et al.
7801269 September 21, 2010 Cravens et al.
7801270 September 21, 2010 Nord et al.
7801988 September 21, 2010 Baumann et al.
7807982 October 5, 2010 Nishiuchi et al.
7809107 October 5, 2010 Nord et al.
7812319 October 12, 2010 Diehl et al.
7812326 October 12, 2010 Grozinger et al.
7816657 October 19, 2010 Hansmann et al.
7817778 October 19, 2010 Nord et al.
7817836 October 19, 2010 Chao et al.
7834334 November 16, 2010 Grozinger et al.
7834336 November 16, 2010 Boeh et al.
7835494 November 16, 2010 Nord et al.
7835502 November 16, 2010 Spence et al.
7839972 November 23, 2010 Ruchala et al.
7839973 November 23, 2010 Nord et al.
7848488 December 7, 2010 Mansfield
7857756 December 28, 2010 Warren et al.
7860216 December 28, 2010 Jongen et al.
7860550 December 28, 2010 Saracen et al.
7868301 January 11, 2011 Diehl
7875861 January 25, 2011 Huttenberger et al.
7875868 January 25, 2011 Moriyama et al.
7881431 February 1, 2011 Aoi et al.
7894574 February 22, 2011 Nord et al.
7906769 March 15, 2011 Blasche et al.
7914734 March 29, 2011 Livingston
7919765 April 5, 2011 Timmer
7920040 April 5, 2011 Antaya et al.
7920675 April 5, 2011 Lomax et al.
7928415 April 19, 2011 Bert et al.
7934869 May 3, 2011 Ivanov et al.
7940881 May 10, 2011 Jongen et al.
7943913 May 17, 2011 Balakin
7947969 May 24, 2011 Pu
7949096 May 24, 2011 Cheng et al.
7950587 May 31, 2011 Henson et al.
7960710 June 14, 2011 Kruip et al.
7961844 June 14, 2011 Takeda et al.
7977648 July 12, 2011 Westerly et al.
7977656 July 12, 2011 Fujimaki et al.
7982198 July 19, 2011 Nishiuchi et al.
7982416 July 19, 2011 Tanaka et al.
7984715 July 26, 2011 Moyers
7986768 July 26, 2011 Nord et al.
7987053 July 26, 2011 Schaffner
7989785 August 2, 2011 Emhofer et al.
7990524 August 2, 2011 Jureller et al.
7997553 August 16, 2011 Sloan et al.
8002466 August 23, 2011 Von Neubeck et al.
8003964 August 23, 2011 Stark et al.
8009803 August 30, 2011 Nord et al.
8009804 August 30, 2011 Siljamaki et al.
8039822 October 18, 2011 Rietzel
8041006 October 18, 2011 Boyden et al.
8044364 October 25, 2011 Yamamoto
8049187 November 1, 2011 Tachikawa
8053508 November 8, 2011 Korkut et al.
8053739 November 8, 2011 Rietzel
8053745 November 8, 2011 Moore
8053746 November 8, 2011 Timmer et al.
8067748 November 29, 2011 Balakin
8069675 December 6, 2011 Radovinsky et al.
8071966 December 6, 2011 Kaiser et al.
8080801 December 20, 2011 Safai
8085899 December 27, 2011 Nord et al.
8089054 January 3, 2012 Balakin
8093564 January 10, 2012 Balakin
8093568 January 10, 2012 Mackie et al.
8111125 February 7, 2012 Antaya et al.
8129699 March 6, 2012 Balakin
8144832 March 27, 2012 Balakin
8173981 May 8, 2012 Trbojevic
8188688 May 29, 2012 Balakin
8198607 June 12, 2012 Balakin
8222613 July 17, 2012 Tajiri et al.
8227768 July 24, 2012 Smick et al.
8232536 July 31, 2012 Harada
8288742 October 16, 2012 Balakin
8291717 October 23, 2012 Radovinsky et al.
8294127 October 23, 2012 Tachibana
8304725 November 6, 2012 Komuro et al.
8304750 November 6, 2012 Preikszas et al.
8309941 November 13, 2012 Balakin
8330132 December 11, 2012 Guertin et al.
8334520 December 18, 2012 Otaka et al.
8335397 December 18, 2012 Takane et al.
8344340 January 1, 2013 Gall et al.
8350214 January 8, 2013 Otaki et al.
8368038 February 5, 2013 Balakin
8368043 February 5, 2013 Havelange et al.
8373143 February 12, 2013 Balakin
8373145 February 12, 2013 Balakin
8378299 February 19, 2013 Frosien
8378321 February 19, 2013 Balakin
8382943 February 26, 2013 Clark
8389949 March 5, 2013 Harada et al.
8399866 March 19, 2013 Balakin
8405042 March 26, 2013 Honda et al.
8405056 March 26, 2013 Amaldi et al.
8415643 April 9, 2013 Balakin
8416918 April 9, 2013 Nord et al.
8421041 April 16, 2013 Balakin
8426833 April 23, 2013 Trbojevic
8436323 May 7, 2013 Iseki et al.
8440987 May 14, 2013 Stephani et al.
8445872 May 21, 2013 Behrens et al.
8466441 June 18, 2013 Iwata et al.
8472583 June 25, 2013 Star-Lack et al.
8483357 July 9, 2013 Siljamaki et al.
8487278 July 16, 2013 Balakin
8552406 October 8, 2013 Phaneuf et al.
8552408 October 8, 2013 Hanawa et al.
8569717 October 29, 2013 Balakin
8581215 November 12, 2013 Balakin
8581523 November 12, 2013 Gall et al.
8581525 November 12, 2013 Antaya et al.
8653314 February 18, 2014 Pelati et al.
8653473 February 18, 2014 Yajima
20020172317 November 21, 2002 Maksimchuk et al.
20030048080 March 13, 2003 Amemiya et al.
20030125622 July 3, 2003 Schweikard et al.
20030136924 July 24, 2003 Kraft et al.
20030152197 August 14, 2003 Moyers
20030163015 August 28, 2003 Yanagisawa et al.
20030183779 October 2, 2003 Norimine et al.
20030234369 December 25, 2003 Glukhoy
20040000650 January 1, 2004 Yanagisawa et al.
20040017888 January 29, 2004 Seppi et al.
20040056212 March 25, 2004 Yanagisawa et al.
20040061077 April 1, 2004 Muramatsu et al.
20040061078 April 1, 2004 Muramatsu et al.
20040085023 May 6, 2004 Chistyakov
20040098445 May 20, 2004 Baumann et al.
20040111134 June 10, 2004 Muramatsu et al.
20040118081 June 24, 2004 Reimoser et al.
20040149934 August 5, 2004 Yanagisawa et al.
20040159795 August 19, 2004 Kaercher et al.
20040173763 September 9, 2004 Moriyama et al.
20040174958 September 9, 2004 Moriyama et al.
20040183033 September 23, 2004 Moriyama et al.
20040183035 September 23, 2004 Yanagisawa et al.
20040200982 October 14, 2004 Moriyama et al.
20040200983 October 14, 2004 Fujimaki et al.
20040213381 October 28, 2004 Harada
20040227104 November 18, 2004 Matsuda et al.
20040232356 November 25, 2004 Norimine et al.
20040240626 December 2, 2004 Moyers
20050058245 March 17, 2005 Ein-Gal
20050089141 April 28, 2005 Brown
20050161618 July 28, 2005 Pedroni
20050184686 August 25, 2005 Caporaso et al.
20050228255 October 13, 2005 Saracen et al.
20050234327 October 20, 2005 Saracen et al.
20050247890 November 10, 2005 Norimine et al.
20060017015 January 26, 2006 Sliski et al.
20060067468 March 30, 2006 Rietzel
20060126792 June 15, 2006 Li
20060145088 July 6, 2006 Ma
20060175991 August 10, 2006 Fujisawa
20060273264 December 7, 2006 Nakayama et al.
20060284562 December 21, 2006 Hruby et al.
20070001128 January 4, 2007 Sliski et al.
20070013273 January 18, 2007 Albert et al.
20070014654 January 18, 2007 Haverfield et al.
20070023699 February 1, 2007 Yamashita et al.
20070029510 February 8, 2007 Hermann et al.
20070051904 March 8, 2007 Kaiser et al.
20070061937 March 22, 2007 Curle
20070092812 April 26, 2007 Caporaso et al.
20070114945 May 24, 2007 Mattaboni et al.
20070145916 June 28, 2007 Caporaso et al.
20070171015 July 26, 2007 Antaya
20070181519 August 9, 2007 Khoshnevis
20070252093 November 1, 2007 Fujimaki et al.
20070284548 December 13, 2007 Kaiser et al.
20080067452 March 20, 2008 Moriyama et al.
20080093567 April 24, 2008 Gall
20080218102 September 11, 2008 Sliski
20090096179 April 16, 2009 Stark et al.
20090140671 June 4, 2009 O'Neal et al.
20090140672 June 4, 2009 Gall et al.
20090200483 August 13, 2009 Gall et al.
20100045213 February 25, 2010 Sliski et al.
20100230617 September 16, 2010 Gall
20100308235 December 9, 2010 Sliski
20110240874 October 6, 2011 Iwata
20110299919 December 8, 2011 Stark
20120081041 April 5, 2012 Cheung et al.
20130053616 February 28, 2013 Gall
20130127375 May 23, 2013 Sliski
20130131424 May 23, 2013 Sliski
20130237425 September 12, 2013 Leigh et al.
20140028220 January 30, 2014 Bromberg et al.
20140042934 February 13, 2014 Tsutsui
20140097920 April 10, 2014 Goldie et al.
20150099917 April 9, 2015 Bula et al.
20150099918 April 9, 2015 Takayanagi et al.
Foreign Patent Documents
2629333 May 2007 CA
1377521 October 2002 CN
1537657 October 2004 CN
1816243 August 2006 CN
101932361 December 2010 CN
101933405 December 2010 CN
101933406 December 2010 CN
101061759 May 2011 CN
2753397 June 1978 DE
31 48 100 June 1983 DE
35 30 446 August 1984 DE
41 01 094 CI May 1992 DE
4411171 October 1995 DE
0 194 728 September 1986 EP
0 277 521 August 1988 EP
0 208 163 January 1989 EP
0 222 786 July 1990 EP
0 221 987 January 1991 EP
0 499 253 August 1992 EP
0 306 966 April 1995 EP
0 388 123 May 1995 EP
0 465 597 May 1997 EP
0 911 064 June 1998 EP
0 864 337 September 1998 EP
0 776 595 December 1998 EP
1 069 809 January 2001 EP
1 153 398 April 2001 EP
1 294 445 March 2003 EP
1 348 465 October 2003 EP
1 358 908 November 2003 EP
1 371 390 December 2003 EP
1 402 923 March 2004 EP
1 430 932 June 2004 EP
1 454 653 September 2004 EP
1 454 654 September 2004 EP
1 454 655 September 2004 EP
1 454 656 September 2004 EP
1 454 657 September 2004 EP
1 477 206 November 2004 EP
1 738 798 January 2007 EP
1 826 778 August 2007 EP
1 949 404 July 2008 EP
2183753 July 2008 EP
2394498 February 2010 EP
2232961 September 2010 EP
2232962 September 2010 EP
2227295 May 2011 EP
1 605 742 June 2011 EP
2363170 September 2011 EP
2363171 September 2011 EP
2 560 421 August 1985 FR
2911843 August 2008 FR
0 957 342 May 1964 GB
2 015 821 September 1979 GB
2 361 523 October 2001 GB
43-23267 October 1968 JP
U48-108098 December 1973 JP
57-162527 October 1982 JP
58-141000 August 1983 JP
61-80800 April 1986 JP
61-225798 October 1986 JP
62-150804 July 1987 JP
62-186500 August 1987 JP
10-071213 March 1988 JP
63-149344 June 1988 JP
63-218200 September 1988 JP
63-226899 September 1988 JP
64-89621 April 1989 JP
01-276797 November 1989 JP
01-302700 December 1989 JP
4-94198 March 1992 JP
04-128717 April 1992 JP
04-129768 April 1992 JP
04-273409 September 1992 JP
04-337300 November 1992 JP
05-341352 December 1993 JP
06-233831 August 1994 JP
06-036893 October 1994 JP
07-260939 October 1995 JP
07-263196 October 1995 JP
08-173890 July 1996 JP
08-264298 October 1996 JP
09-162585 June 1997 JP
11-47287 February 1999 JP
11-102800 April 1999 JP
11-243295 September 1999 JP
2000-243309 September 2000 JP
2000-294399 October 2000 JP
2001-6900 January 2001 JP
2001-009050 January 2001 JP
2001-129103 May 2001 JP
2001-346893 December 2001 JP
2002-164686 June 2002 JP
A2003-504628 February 2003 JP
2003-517755 May 2003 JP
2004-031115 January 2004 JP
2005-526578 September 2005 JP
2006-032282 February 2006 JP
05-046928 March 2008 JP
2008-507826 March 2008 JP
2009-515671 April 2009 JP
2009-516905 April 2009 JP
2010-536130 November 2010 JP
2011-505191 February 2011 JP
2011-505670 February 2011 JP
2011-507151 March 2011 JP
300137 November 1969 SU
569 635 August 1977 SU
200930160 July 2009 TW
200934682 August 2009 TW
200939908 September 2009 TW
200940120 October 2009 TW
WO 86/07229 December 1986 WO
WO 90/12413 October 1990 WO
WO 92/03028 February 1992 WO
WO 93/02536 February 1993 WO
WO 98/17342 April 1998 WO
WO 99/39385 August 1999 WO
WO 00/40064 July 2000 WO
WO 00/49624 August 2000 WO
WO 01/26230 April 2001 WO
WO 01/26569 April 2001 WO
WO 02/07817 January 2002 WO
WO 03/039212 May 2003 WO
WO 03/092812 November 2003 WO
WO 2004/026401 April 2004 WO
WO 2004/101070 November 2004 WO
WO 2006-012467 February 2006 WO
WO 2007/061937 May 2007 WO
WO 2007/084701 July 2007 WO
WO 2007/130164 November 2007 WO
WO 2007/145906 December 2007 WO
WO 2008/030911 March 2008 WO
WO 2008/081480 October 2008 WO
WO 2009/048745 April 2009 WO
WO 2009/070173 June 2009 WO
WO 2009/070588 June 2009 WO
WO 2009/073480 June 2009 WO
WO2014/018706 January 2014 WO
WO2014/018876 January 2014 WO
WO 2014/052721 April 2014 WO
Other references
  • US 8,581,524, 11/2013, O'Neal et al. (withdrawn)
  • U.S. Appl. No. 61/676,377, filed Jul. 27, 2012, including the USPTO electronic file for U.S. Appl. No. 61/676,377.
  • U.S. Appl. No. 13/949,459, filed Jul. 24, 2013, including the USPTO electronic file for U.S. Appl. No. 13/949,459.
  • U.S. Appl. No. 13/830,792, filed Mar. 14, 2013, including the USPTO electronic file for U.S. Appl. No. 13/830,792.
  • European Communication from European application No. 13774886.9 issued on Jun. 12, 2015 (2 pages).
  • Response to European Communication mailed Jun. 12, 2015 in European application No. 13774886.9 filed on Jun. 23, 2015 (17 pages).
  • “Beam Delivery and Properties,” Journal of the ICRU, 2007, 7(2):20 pages.
  • “510(k) Summary: Ion Beam Applications S.A.”, FDA, Jul. 12, 2001, 5 pages.
  • “510(k) Summary: Optivus Proton Beam Therapy System”, Jul. 21, 2000, 5 pages.
  • “An Accelerated Collaboration Meets with Beaming Success,” Lawrence Livermore National Laboratory, Apr. 12, 2006, S&TR, Livermore, California, pp. 1-3, http://www.llnl.gov/str/April06/Caporaso.html.
  • “CPAC Highlights Its Proton Therapy Program at ESTRO Annual Meeting”, TomoTherapy Incorporated, Sep. 18, 2008, Madison, Wisconsin, pp. 1-2.
  • “Indiana's mega-million proton therapy cancer center welcomes its first patients” [online] Press release, Health & Medicine Week, 2004, retrieved from NewsRx.com, Mar. 1, 2004, pp. 119-120.
  • “LLNL, UC Davis Team Up to Fight Cancer,”Lawrence Livermore National Laboratory, Apr. 28, 2006, SF-06-04-02, Livermore, California, pp. 1-4.
  • “Patent Assignee Search Paul Scherrer Institute,” Library Services at Fish & Richardson P.C., Mar. 20, 2007, 40 pages.
  • “Patent Prior Art Search for ‘Proton Therapy System’,” Library Services at Fish & Richardson P.C., Mar. 20, 2007, 46 pages.
  • “Superconducting Cyclotron Contract” awarded by Paul Scherrer Institute (PSI), Villigen, Switzerland, http://www.accel.de/News/superconducting—cyclotron—contract.htm, Jan. 2009, 1 page.
  • “The Davis 76-Inch Isochronous Cyclotron”, Beam on: Crocker Nuclear Laboratory, University of California, 2009, 1 page.
  • “The K100 Neutron-therapy Cyclotron,” National Superconducting Cyclotron Laboratory at Michigan State University (NSCL), retrieved from: http://www.nscl.msu.edu/tech/accelerators/k100, Feb. 2005, 1 page.
  • “The K250 Proton therapy Cyclotron,” National Superconducting Cyclotron Laboratory at Michigan State University (NSCL), retrieved from: http://www.nscl.msu.edu/tech/accelerators/k250.html , Feb. 2005, 2 pages.
  • “The K250 Proton-therapy Cyclotron Photo Illustration,” National Superconducting Cyclotron Laboratory at Michigan State University (NSCL), retrieved from: http://www.nscl.msu.edu/media/image/experimental-equipment-technology/250.html, Feb. 2005, 1 page.
  • 18th Japan Conference on Radiation and Radioisotopes [Japanese], Nov. 25-27, 1987, 9 pages.
  • Abrosimov et al., “1000MeV Proton Beam Therapy facility at Petersburg Nuclear Physics Institute Synchrocyclotron,” Medical Radiology (Moscow) 32, 10 (1987) revised in Journal of Physics, Conference Series 41, 2006, pp. 424-432, Institute of Physics Publishing Limited.
  • Abrosimov et al., “Neutron Time-of-flight Spectrometer Gneis at the Gatchina 1 GeV Protron Syncrhocyclotron”, Mar. 9, 1985 and revised form Jul. 31, 1985, Lemingrad Nuclear Physics Institute, Gatchina, 188350, USSR (15 pages).
  • Adachi et al., “A 150MeV FFAG Synchrotron with “Return-Yoke Free” Magent,” Proceedings of the 2001 Particle Accelerator Conference, Chicago, 2001, 3 pages.
  • Ageyev et al., “The IHEP Accelerating and Storage Complex (UNK) Status Report,” 11th International Conference on High-Energy Accelerators, 1980, pp. 60-70.
  • Agosteo et al., “Maze Design of a gantry room for proton therapy, ”Nuclear Instruments & Methods in Physics Research, 1996, Section A, 382, pp. 573-582.
  • Alexeev et al., “R4 Design of Superconducting Magents for Proton Synchrotrons,” Proceedings of the Fifth International Cryogenic Engineering Conference, 1974, pp. 531-533.
  • Allardyce et al., “Performance and Prospects of the Reconstructed CERN 600 MeV Synchrocyclotron,” IEEE Transactions on Nuclear Science USA, Jun. 1977, ns-24:(3)1631-1633.
  • Alonso, “Magnetically Scanned Ion Beams for Radiation Therapy,” Accelerator & Fusion Research Division, Lawrence Berkeley Laboratory, Berkeley, CA, Oct. 1988, 13 pages.
  • Amaldi et al., “The Italian project for a hadrontherapy centre” Nuclear Instruments and Methods in Physics Research A, 1995, 360, pp. 297-301.
  • Amaldi, “Overview of the world landscape of Hadrontherapy and the projects of the TERA foundation,” Physica Medica, An International journal Devoted to the Applications of Physics to Medicine and Biology, Jul. 1998, vol. XIV, Supplement 1, 6th Workshop on Heavy Charged Particles in Biology and Medicine, Instituto Scientific Europeo (ISE), Sep. 29-Oct. 1, 1977, Baveno, pp. 76-85.
  • Anferov et al., “Status of the Midwest Proton Radiotherapy Institute,” Proceedings of the 2003 Particle Accelerator Conference, 2003, pp. 699-701.
  • Anferov et al., “The Indiana University Midwest Proton Radiation Institute,” Proceedings of the 2001 Particle Accelerator Conference, 2001, Chicago, pp. 645-647.
  • Appun, “Various problems of magnet fabrication for high-energy accelerators.” Journal for All Engineers Interested in the Nuclear Field, 1967, pp. 10-16 (1967) [Lang.: German], English bibliographic information (http://www.osti.gov/energycitations/product.biblio.jsp?osti—id=4442292).
  • Arduini et al. “Physical specifications of clinical proton beams from a synchrotron,” Med. Phys, Jun. 1996, 23 (6): 939-951.
  • Badano et al., “Proton-Ion Medical Machine Study (PIMMS) Part I,” PIMMS, Jan. 1999, 238 pages.
  • Beeckman et al., “Preliminary design of a reduced cost proton therapy facility using a compact, high field isochronous cyclotron,” Nuclear Instruments and Methods in Physics Research B56/57, 1991, pp. 1201-1204.
  • Bellomo et al., “The Superconducting Cyclotron Program at Michigan State University,” Bulletin of the American Physical Society, Sep. 1980, 25(7):767.
  • Benedikt and Carli, “Matching to Gantries for Medical Synchrotrons” IEEE Proceedings of the 1997 Particle Accelerator Conference, 1997, pp. 1379-1381.
  • Bieth et al., “A Very Compact Protontherapy Facility Based on an Extensive Use of High Temperature Superconductors (HTS)” Cyclotrons and their Applications 1998, Proceedings of the Fifteenth International Conference on Cyclotrons and their Applications, Caen, Jun. 14-19, 1998, pp. 669-672.
  • Bigham, “Magnetic Trim Rods for Superconducting Cyclotrons,” Nuclear Instruments and Methods (North-Holland Publishing Co.), 1975, 141:223-228.
  • Bimbot, “First Studies of the External Beam from the Orsay S.C. 200 MeV,” Institut de Physique Nucleaire, BP 1, Orsay, France, IEEE, 1979, pp. 1923-1926.
  • Blackmore et al., “Operation of the Triumf Proton Therapy Facility,” IEEE Proceedings of the 1997 Particle Accelerator Conference, May 12-16, 19973:3831-3833.
  • Bloch, “The Midwest Proton Therapy Center,” Application of Accelerators in Research and Industry, Proceedings of the Fourteenth Int'l. Conf., Part Two, Nov. 1996, pp. 1253-1255.
  • Blosser et al., “Problems and Accomplishments of Superconducting Cyclotrons,” Proceedings of the 14th International Conference, Cyclotrons and Their Applications, Oct. 1995, pp. 674-684.
  • Blosser et al., “Superconducting Cyclotrons”, Seventh International Conference on Cyclotrons and their Applications, Aug. 19-22, 1975, pp. 584-594.
  • Blosser et al., “Progress toward an experiment to study the effect of RF grounding in an internal ion source on axial oscillations of the beam in a cyclotron,” National Superconducting Cyclotron Laboratory, Michigan State University, Report MSUCL-760, CP600, Cyclotrons and their Applications 2011, Sixteenth International Conference, 2001, pp. 274-276.
  • Blosser et al., “A Compact Superconducting Cyclotron for the Production of High Intensity Protons,” Proceedings of the 1997 Particle Accelerator Conference, May 12-16, 1997, 1:1054-1056.
  • Blosser et al., “Advances in Superconducting Cyclotrons at Michigan State University,” Proceedings of the 11th International Conference on Cyclotrons and their Applications, Oct. 1986, pp. 157-167, Tokyo.
  • Blosser et al., “Characteristics of a 400 (Q2/A) MeV Super-Conducting Heavy-Ion Cyclotron,” Bulletin of the American Physical Society, Oct. 1974, p. 1026.
  • Blosser et al., “Medical Accelerator Projects at Michigan State Univ.” IEEE Proceedings of the 1989 Particle Accelerator Conference, Mar. 20-23, 1989, 2:742-746.
  • Blosser et al., “Superconducting Cyclotron for Medical Application”, IEEE Transactions on Magnetics, Mar. 1989, 25(2): 1746-1754.
  • Blosser, “Application of Superconductivity in Cyclotron Construction,” Ninth International Conference on Cyclotrons and their Applications, Sep. 1981, pp. 147-157.
  • Blosser, “Applications of Superconducting Cyclotrons,” Twelfth International Conference on Cyclotrons and Their Applications, May 8-12, 1989, pp. 137-144.
  • Blosser, “Future Cyclotrons,” AIP, The Sixth International Cyclotron Conference, 1972, pp. 16-32.
  • Blosser, “Medical Cyclotrons,” Physics Today, Special Issue Physical Review Centenary, Oct. 1993, pp. 70-73.
  • Blosser, “Preliminary Design Study Exploring Building Features Required for a Proton Therapy Facility for the Ontario Cancer Institute”, Mar. 1991, MSUCL-760a, 53 pages.
  • Blosser, “Progress on the Coupled Superconducting Cyclotron Project,” Bulletin of the American Physical Society, Apr. 1981, 26(4):558.
  • Blosser, “Synchrocyclotron Improvement Programs,” IEEE Transactions on Nuclear Science USA, Jun. 1969, 16(3):Part I, pp. 405-414.
  • Blosser, “The Michigan State University Superconducting Cyclotron Program,” Nuclear Science, Apr. 1979, NS-26(2):2040-2047.
  • Blosser, H., Present and Future Superconducting Cyclotrons, Bulletin of the American Physical Society, Feb. 1987, 32(2):171 Particle Accelerator Conference, Washington, D.C.
  • Blosser, H.G., “Superconducting Cyclotrons at Michigan State University”, Nuclear Instruments & Methods in Physics Research, 1987,vol. B 24/25, part II, pp. 752-756.
  • Botha et al., “A New Multidisciplinary Separated-Sector Cyclotron Facility,” IEEE Transactions on Nuclear Science, 1977, NS-24(3):1118-1120.
  • Chichili et al., “Fabrication of Nb3Sn Shell-Type Coils with Pre-Preg Ceramic Insulation,” American Institute of Physics Conference Proceedings, AIP USA, No. 711, (XP-002436709, ISSN: 0094-243X), 2004, pp. 450-457.
  • Chong et al., Radiology Clinic North American 7, 3319, 1969, 27 pages.
  • Chu et al., “Performance Specifications for Proton Medical Facility,” Lawrence Berkeley Laboratory, University of California, Mar. 1993, 128 pages.
  • Chu et al., “Instrumentation for Treatment of Cancer Using Proton and Light-ion Beams,” Review of Scientific Instruments, Aug. 1993, 64 (8):2055-2122.
  • Chu, “Instrumentation in Medical Systems,” Accelerator and Fusion Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA, May 1995, 9 pages.
  • Cole et al., “Design and Application of a Proton Therapy Accelerator,” Fermi National Accelerator Laboratory, IEEE, 1985, 5 pages.
  • Collins, et al., “The Indiana University Proton Therapy System,” Proceedings of EPAC 2006, Edinburgh, Scotland, 2006, 3 pages.
  • Conradi et al., “Proposed New Facilities for Proton Therapy at iThemba Labs,” Proceedings of EPAC, 2002, pp. 560-562.
  • C/E Source of Ions for Use in Sychro-Cyclotrons Search, Jan. 31, 2005, 9 pages.
  • Source Search “Cites of U.S. and Foreign Patents/Published applications in the name of Mitsubishi Denki Kabushiki Kaisha and Containing the Keywords (Proton and Synchrocyclotron),” Jan. 2005, 8 pages.
  • Cosgrove et al., “Microdosimetric Studies on the Orsay Proton Synchrocyclotron at 73 and 200 MeV,” Radiation Protection Dosimetry, 1997, 70(1-4):493-496.
  • Coupland, “High-field (5 T) pulsed superconducting dipole magnet,” Proceedings of the Institution of Electrical Engineers, Jul. 1974, 121(7):771-778.
  • Coutrakon et al. “Proton Synchrotrons for Cancer Therapy,” Application of Accelerators in Research and Industry—Sixteenth International Conf., American Institute of Physics, Nov. 1-5, 2000, vol. 576, pp. 861-864.
  • Coutrakon et al., “A prototype beam delivery system for the proton medical accelerator at Loma Linda,” Medical Physics, Nov./Dec. 1991, 18(6):1093-1099.
  • Cuttone, “Applications of a Particle Accelerators in Medical Physics,” Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud, V.S. Sofia, 44 Cantania, Italy, Jan. 2010, 17 pages.
  • Dahl P, “Superconducting Magnet System,” American Institute of Physics, AIP Conference Proceedings, 1987-1988, 2: 1329-1376.
  • Dialog Search, Jan. 31, 2005, 17 pages.
  • Dugan et al., “Tevatron Status” IEEE, Particle Accelerator Conference, Accelerator Science & Technology, 1989, pp. 426-430.
  • Eickhoff et al., “The Proposed Accelerator Facility for Light Ion Cancer Therapy in Heidelberg,” Proceedings of the 1999 Particle Accelerator Conference, New York, 1999, pp. 2513-2515.
  • Enchevich et al., “Minimizing Phase Losses in the 680 MeV Synchrocyclotron by Correcting the Accelerating Voltage Amplitude,” Atomnaya Energiya, 1969, 26:(3):315-316.
  • Endo et al., “Compact Proton and Carbon Ion Synchrotrons for Radiation Therapy,” Proceedings of EPAC 2002, Paris France, 2002, pp. 2733-2735.
  • Flanz et al., “Treating Patients with the NPTC Accelerator Based Proton Treatment Facility,” Proceedings of the 2003 Particle Accelerator Conference, 2003, pp. 690-693.
  • Flanz et al., “Large Medical Gantries,” Particle Accelerator Conference, Massachusetts General Hospital, 1995, pp. 1-5.
  • Flanz et al., “Operation of a Cyclotron Based Proton Therapy Facility”, Massachusetts General Hospital, Boston, MA 02114, pp. 1-4, retrieved from Internet in 2009.
  • Flanz et al., “The Northeast Proton Therapy Center at Massachusetts General Hospital,” Fifth Workshop on Heavy Charge Particles in Biology and Medicine, GSI, Darmstadt, Aug. 1995, 11 pages.
  • Flood and Frazier, “The Wide-Band Driven RF System for the Berkeley 88-Inch Cyclotron,” American Institute of Physics, Conference Proceedings., No. 9, 1972, 459-466.
  • Foster and Kashikhin, “Superconducting Superferric Dipole Magent with Cold Iron Core for the VLHC,” IEEE Transactions on Applied Superconductivity, Mar. 2002, 12(1):111-115.
  • Friesel et al., “Design and Construction Progress on the IUCF Midwest Proton Radiation Institute,” Proceedings of EPAC 2002, 2002, pp. 2736-2738.
  • Fukumoto et al., “A Proton Therapy Facility Plan” Cyclotrons and their Applications, Proceedings of the 13th International Conference, Vancouver, Canada, Jul. 6-10, 1992, pp. 258-261.
  • Fukumoto, “Cyclotron Versus Synchrotron for Proton Beam Therapy,” KEK Prepr., No. 95-122, Oct. 1995, pp. 533-536.
  • Goto et al., “Progress on the Sector Magnets for the Riken SRC,” American Institute of Physics, CP600, Cyclotrons and Their Applications 2001, Sixteenth International Conference, 2001, pp. 319-323.
  • Graffman et al., “Design Studies for a 200 MeV Proton Clinic for Radiotherapy,” AIP Conference Proceedings: Cyclotrons—1972, 1972, No. 9, pp. 603-615.
  • Graffman et al., Acta Radial. Therapy Phys. Biol. 1970, 9, 1 (1970).
  • Graffman, et. al. “Proton radiotherapy with the Uppsala cyclotron. Experience and plans” Strahlentherapie, 1985, 161(12):764-770.
  • Hede, “Research Groups Promoting Proton Therapy “Lite,”” Journal of the National Cancer Institute, Dec. 6, 2006, 98(23):1682-1684.
  • Heinz, “Superconducting Pulsed Magnetic Systems for High-Energy Synchrotrons,” Proceedings of the Fourth International Cryogenic Engineering Conference, May 24-26, 1972, pp. 55-63.
  • Hentschel et al., “Plans for the German National Neutron Therapy Centre with a Hospital-Based 70 MeV Proton Cyclotron at University Hospital Essen/Germany,” Cyclotrons and their Applications, Proceedings of the Fifteenth International Conference on Cyclotrons and their Applications, Caen, Franco, Jun. 14-19, 1998, pp. 21-23.
  • Hepburn et al., “Superconducting Cyclotron Neutron Source for Therapy,” International Journal of Radiation Oncology Biology Physics, vol. 3 complete, 1977, pp. 387-391.
  • Hirabayashi, “Development of Superconducting Magnets for Beam Lines and Accelerator at KEK,” IEEE Transaction on Magnetics, Jan. 1981, Mag-17(1):728-731.
  • Ishibashi and McInturff, “Winding Design Study of Superconducting 10 T Dipoles for a Synchrotron,” IEEE Transactions on Magnetics, May 1983, MAG-19(3):1364-1367.
  • Ishibashi and McInturff, “Stress Analysis of Superconducting 10T Magnets for Synchrotron,” Proceedings of the Ninth International Cryogenic Engineering Conference, May 11-14, 1982, pp. 513-516.
  • Jahnke et al., “First Superconducting Prototype Magnets for a Compact Synchrotron Radiation Source in Operation,” IEEE Transactions on Magnetics, Mar. 1988, 24(2):1230-1232.
  • Jones and Dershem, “Synchrotron Radiation from Proton in a 20 TEV, 10 TESLA Superconducting Super Collide,r” Proceedings of the 12th International Conference on High-Energy Accelerator, Aug. 11-16, 1983, pp. 138-140.
  • Jones and Mills, “The South African National Accelerator Centre: Particle Therapy and Isotope Production Programmes,” Radiation Physics and Chemistry, Apr.-Jun. 1998, 51(4-6):571-578.
  • Jones et al., “Status Report of the NAC Particle Therapy Programme,” Stralentherapie und Onkologie, vol. 175, Suppl. II, Jun. 1999, pp. 30-32.
  • Jones, “Progress with the 200 MeV Cyclotron Facility at the National Accelerator Centre,” Commission of the European Communities Radiation Protection Proceedings, Fifth Symposium on Neutron Dosimetry, Sep. 17-21, 1984, vol. II, pp. 989-998.
  • Jones, “Present Status and Future Trends of Heavy Particle Radiotherapy,” Cyclotrons and their Applications 1998, Proceedings of the Fifteenth International Conference on Cyclotrons and their Applications, Jun. 14-19, 1998, pp. 13-20.
  • Jongen et al., “Development of a Low-cost Compact Cyclotron System for Proton Therapy,” National Institute of Radiol. Sci, 1991, No. 81, pp. 189-200.
  • Jongen et al., “Progress report on the IBA-SHI small cyclotron for cancer therapy” Nuclear Instruments and Methods in Physics Research, Section B, vol. 79, issue 1-4, 1993, pp. 885-889.
  • Jongen et al., “The proton therapy system for the NPTC: Equipment Description and progress report,” Nuclear Instruments and methods in physics research, 1996, Section B, 113(1): 522-525.
  • Jongen et al., “The proton therapy system for MGH's NPTC: equipment description and progress report,” Bulletin du Cancer/Radiotherapie, Proceedings of the meeting of the European Heavy Particle Therapy Group, 1996, 83(Suppl. 1):219-222.
  • Kanai et al., “Three-dimensional Beam Scanning for Proton Therapy,” Nuclear Instruments and Methods in Physic Research, Sep. 1, 1983, The Netherlands, 214(23):491-496.
  • Karlin et al., “Medical Radiology” (Moscow), 1983, 28, 13.
  • Karlin et al., “The State and Prospects in the Development of the Medical Proton Tract on the Synchrocyclotron in Gatchina,” Med. Radiol., Moscow, 28(3):28-32 (Mar. 1983)(German with English Abstract on end of p. 32).
  • Kats and Druzhinin, “Comparison of Methods for Irradiation Prone Patients,” Atomic Energy, Feb. 2003, 94(2):120-123.
  • Kats and Onosovskii, “A Simple, Compact, Flat System for the Irradiation of a Lying Patient with a Proton Beam from Different Directions,” Instruments and Experimental Techniques, 1996, 39(1): 132-134.
  • Kats and Onosovskii, “A Planar Magnetooptical System for the Irradiation of a Lying Patient with a Proton Beam from Various Directions,” Instruments and Experimental Techniques, 1996, 39(1):127-131.
  • Khoroshkov et al.,“Moscow Hospital-Based Proton Therapy Facility Design,” Am. Journal Clinical Oncology: CCT, Apr. 1994, 17(2):109-114.
  • Kim and Blosser, “Optimized Magnet for a 250 MeV Proton Radiotherapy Cyclotron,” Cyclotrons and Their Applications 2001, May 2001, Sixteenth International Conference, pp. 345-347.
  • Kim and Yun, “A Light-Ion Superconducting Cyclotron System for Multi-Disciplinary Users,” Journal of the Korean Physical Society, Sep. 2003, 43(3):325-331.
  • Kim et al., “Construction of 8T Magnet Test Stand for Cyclotron Studies,” IEEE Transactions on Applied Superconductivity, Mar. 1993, 3(1):266-268.
  • Kim et al., “Design Study of a Superconducting Cyclotron for Heavy Ion Therapy,” Cyclotrons and Their Applications 2001, Sixteenth International Conference, May 13-17, 2001, pp. 324-326.
  • Kim et al., “Trim Coil System for the Riken Cyclotron Ring Cyclotron,” Proceedings of the 1997 Particle Accelerator Conference, IEEE, Dec. 1981, vol. 3, pp. 214-235 or 3422-3424, 1998.
  • Kim, “An Eight Tesla Superconducting Magnet for Cyclotron Studies,” Ph.D. Dissertation, Michigan State University, Department of Physics and Astronomy, 1994, 138 pages.
  • Kimstrand, “Beam Modelling for Treatment Planning of Scanned Proton Beams,” Digital Comprehensive Summaries of Uppsala dissertations from the Faculty of Medicine 330, Uppsala Universitet, 2008, 58 pages.
  • Kishida and Yano, “Beam Transport System for the RIKEN SSC (II),” Scientific Papers of the Institute of Physical and Chemical Research, Dec. 1981, 75(4):214-235.
  • Koehler et al., “Range Modulators for Protons and Heavy Ions,” Nuclear Instruments and Methods, 1975, vol. 131, pp. 437-440.
  • Koto and Tsujii, “Future of Particle Therapy,” Japanese Journal of Cancer Clinics, 2001, 47(1):95-98 [Lang.: Japanese], English abstract (http://sciencelinks.jp/j-east/article/200206/000020020601A0511453.php).
  • Kraft et al., “Hadrontherapy in Oncology,” U. Amaldi and Larrsson, editors Elsevier Science, 1994, 390 pages.
  • Krevet et al., “Design of a Strongly Curved Superconducting Bending Magnet for a Compact Synchrotron Light Source,” Advances in Cryogenic Engineering, 1988, vol. 33, pp. 25-32.
  • Laisne et al., “The Orsay 200 MeV Synchrocyclotron,” IEEE Transactions on Nuclear Science, Apr. 1979, NS-26(2):1919-1922.
  • Larsson et al., Nature,1958, 182:1222.
  • Larsson, “Biomedical Program for the Converted 200-MeV Synchrocyclotron at the Gustaf Werner Institute,” Radiation Research, 1985, 104:S310-S318.
  • Lawrence et al., “Heavy particles in acromegaly and Cushing's Disease,” in Endocrine and Norendocrine Hormone Producing Tumors (Year Book Medical Chicago, 1973, pp. 29-61.
  • Lawrence et al., “Successful Treatment of Acromegaly: Metabolic and Clinical Studies in 145 Patients,” The Journal of Clinical Endrocrinology and Metabolism, Aug. 1970, 31(2), 21 pages.
  • Lawrence et al., “Treatment of Pituitary Tumors,” (Excerpta medica, Amsterdam/American Elsevier, New York, 1973, pp. 253-262.
  • Lawrence, Cancer, 1957, 10:795.
  • Lecroy et al., “Viewing Probe for High Voltage Pulses,” Review of Scientific Instruments USA, Dec. 1960, 31(12):1354.
  • Lin et al., “Principles and 10 Year Experience of the Beam Monitor System at the PSI Scanned Proton Therapy Facility”, Center for Proton Radiation Therapy, Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland, 2007, 21 pages.
  • Linfoot et al., “Acromegaly,” in Hormonal Proteins and Peptides, edited by C.H. Li, 1975, pp. 191-246.
  • Literature Author and Keyword Search, Feb. 14, 2005, 44 pages.
  • Literature Keyword Search, Jan. 24, 2005, 98 pages.
  • Literature Search and Keyword Search for Synchrocyclotron, Jan. 25, 2005, 68 pages.
  • Literature Search by Company Name/Component Source, Jan. 24, 2005, 111 pages.
  • Literature Search, Jan. 26, 2005, 37 pages.
  • Livingston et al., “A capillary ion source for the cyclotron,” Review Science Instruments, Feb. 1939, 10:63.
  • Mandrillon, “High Energy Medical Accelerators,” EPAC 90, 2nd European Particle Accelerator Conference, Jun. 12-16, 1990, 2:54-58.
  • Marchand et al., “IBA Proton Pencil Beam Scanning: an Innovative Solution for Cancer Treatment,” Proceedings of EPAC 2000, Vienna, Austria, 3 pages.
  • Marti et al., “High Intensity Operation of a Superconducting Cyclotron,” Proceedings of the 14the International Conference, Cyclotrons and Their Applications, Oct. 1995, pp. 45-48 (Oct. 1995).
  • Martin, “Operational Experience with Superconducting Synchrotron Magnets” Proceedings of the 1987 IEEE Particle Accelerator Conference, Mar. 16-19, 1987, vol. 3 of 3:1379-1382.
  • Meote et al., “ETOILE Hadrontherapy Project, Review of Design Studies” Proceedings of EPAC 2002, 2002, pp. 2745-2747.
  • Miyamoto et al., “Development of the Proton Therapy System,” The Hitachi Hyoron, 79(10):775-779 (1997) [Lang: Japanese], English abstract (http://www.hitachi.com/rev/1998/revfeb98/rev4706.htm).
  • Montelius et al., “The Narrow Proton Beam Therapy Unit at the Svedberg Laboratory in Uppsala,” ACTA Oncologica, 1991, 30:739-745.
  • Moser et al., “Nonlinear Beam Optics with Real Fields in Compact Storage Rings,” Nuclear Instruments & Methods in Physics Research/Section B, B30, Feb. 1988, No. 1, pp. 105-109.
  • Moyers et al., “A Continuously Variable Thickness Scatterer for Proton Beams Using Self-compensating Dual Linear Wedges” Lorna Linda University Medical Center, Dept. of Radiation Medicine, Lorna Linda, CA, Nov. 2, 1992, 21 pages.
  • National Cancer Institute Funding (Senate-Sep. 21, 1992) (www.thomas.loc.gov/cgi-bin/query/z?r102:S21SE2-712 (2 pages).
  • Nicholson, “Applications of Proton Beam Therapy,” Journal of the American Society of Radiologic Technologists, May/Jun. 1996, 67(5): 439-441.
  • Nolen et al., “The Integrated Cryogenic—Superconducting Beam Transport System Planned for MSU,” Proceedings of the 12th International Conference on High-Energy Accelerators, Aug. 1983, pp. 549-551.
  • Norimine et al., “A Design of a Rotating Gantry with Easy Steering for Proton Therapy,” Proceedings of EPAC 2002, 2002, pp. 2751-2753.
  • Ogino, Takashi, “Heavy Charged Particle Radiotherapy-Proton Beam”, Division of Radiation Oncology, National Cancer Hospital East, Kashiwa, Japan, Dec. 2003, 7 pages.
  • Okumura et al., “Overview and Future Prospect of Proton Radiotherapy,” Japanese Journal of Cancer Clinics, 1997, 43(2):209-214 [Lang.: Japanese].
  • Okumura et al., “Proton Radiotherapy” Japanese Journal of Cancer and Chemotherapy, 1993, 10.20(14):2149-2155[Lang.: Japanese].
  • Outstanding from Search Reports, “Accelerator of Polarized Portons at Fermilab,” 2005, 20 pages.
  • Paganetti et al., “Proton Beam Radiotherapy—The State of the Art,” Springer Verlag, Heidelberg, ISBN 3-540-00321-5, Oct. 2005,36 pages.
  • Palmer and Tollestrup, “Superconducting Magnet Technology for Accelerators,” Annual Review of Nuclear and Particle Science, 1984, vol. 34, pp. 247-284.
  • Patent Assignee and Keyword Searches for Synchrocyclotron, Jan. 25, 2005, 78 pages.
  • Pavlovic, “Beam-optics study of the gantry beam delivery system for light-ion cancer therapy,” Nuclear Instruments and Methods in Physics Research, Section A, Nov. 1997, 399(2):439-454(16).
  • Pedroni and Enge, “Beam optics design of compact gantry for proton therapy” Medical & Biological Engineering & Computing, May 1995, 33(3):271-277.
  • Pedroni and Jermann, “SGSMP: Bulletin Mar. 2002 Proscan Project, Progress Report on the PROSCAN Project of PSI” [online] retrieved from www.sgsmp.ch/protA23.htm, Mar. 2002, 5 pages.
  • Pedroni et al., “A Novel Gantry for Proton Therapy at the Paul Scherrer Institute,” Cycloctrons and Their Applications 2001: Sixteenth International Conference. AIP Conference Proceedings, 2001, 600:13-17.
  • Pedroni et al., “The 200-MeV proton therapy project at the Paul Scherrer Institute: Conceptual design and practical realization,” Medical Physics, Jan. 1995, 22(1):37-53.
  • Pedroni, “Accelerators for Charged Particle Therapy: Performance Criteria from the User Point of View,” Cyclotrons and their Applications, Proceedings of the 13th International Conference, Jul. 6-10, 1992, pp. 226-233.
  • Pedroni, “Latest Developments in Proton Therapy” Proceedings of EPAC 2000, pp. 240-244, 2000.
  • Pedroni, “Status of Proton Therapy: results and future trends,” Paul Scherrer Institute, Division of Radiation Medicine, 1994, 5 pages.
  • Peggs et al., “A Survey of Hadron Therapy Accelerator Technologies,” Particle Accelerator Conference, Jun. 25-29, 2007, 7 pages.
  • Potts et al., “MPWP6-Therapy III: Treatment Aids and Techniques” Medical Physics, Sep./Oct. 1988, 15(5):798.
  • Pourrahimi et al., “Powder Metallurgy Processed Nb3Sn(Ta) Wire for High Field NMR magnets,” IEEE Transactions on Applied Superconductivity, Jun. 1995, 5(2):1603-1606.
  • Prieels et al., “The IBA State-of-the-Art Proton Therapy System, Performances and Recent Results,” Application of Accelerators in Research and industry—Sixteenth Int'l. Conf., American Institute of Physics, Nov. 1-5, 2000, 576:857-860.
  • Rabin et al., “Compact Designs for Comprehensive Proton Beam Clinical Facilities,” Nuclear Instruments & Methods in Physics Research, Apr. 1989, Section B, vol. 40-41, Part II, pp. 1335-1339.
  • Research & Development Magazine, “Proton Therapy Center Nearing Completion,” Aug. 1999, 41(9):2 pages, (www.redmag.com).
  • Resmini, “Design Characteristics of the K=800 Superconducting Cyclotron at M.S.U.,” Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, IEEE Transaction on Nuclear Science, vol. NS-26, No. 2, Apr. 1979, 8 pages.
  • RetroSearch “Berkeley 88-Inch Cyclotron ‘RF’ or ‘Frequency Control’,” Jan. 21, 2005, 36 pages.
  • RetroSearch “Berkeley 88-Inch Cyclotron,” Jan. 24, 2005, 170 pages.
  • RetroSearch “Bernard Gottschalk, Cyclotron, Beams, Compensated Upstream Modulator, Compensated Scatter,” Jan. 21, 2005, 20 pages.
  • RetroSearch “Cyclotron with ‘RF’ or ‘Frequency Control’,” Jan. 21, 2005, 49 pages.
  • RetroSearch Gottschalk, Bernard, Harvard Cyclotron Wheel, Jan. 21, 2005, 20 pages.
  • RetroSearch “Loma Linda University Beam Compensation,” Jan. 21, 2005, 60 pages.
  • RetroSearch “Loma Linda University, Beam Compensation Foil Wedge,” Jan. 21, 2005, 15 pages.
  • Revised Patent Keyword Search, Jan. 25, 2005, 88 pages.
  • Rifuggiato et, al., “Status Report of the LNS Superconducting Cyclotron” Nukleonika, 2003, 48: S131-S134, Supplement 2.
  • Rode, “Tevatron Cryogenic System,” Proceedings of the 12th International Conference on High-energy Accelerators, Fermilab, Aug. 11-16, 1983, pp. 529-535.
  • Salzburger et al., “Superconducting Synchrotron Magnets Supraleitende Synchrotronmagnete,” Siemens A.G., Erlangen (West Germany). Abteilung Technische Physik, Report No. BMFT-FB-T-75-25, Oct. 1975, p. 147, Journal Announcement: GRAI7619; STAR1415, Subm-Sponsored by Bundesmin. Fuer Forsch. U. Technol. In German; English Summary.
  • Schillo et al,. “Compact Superconducting 250 MeV Proton Cyclotron for the PSI Proscan Proton Therapy Project,” Cyclotrons and Their Applications 2001, Sixteenth International Conference, 2001, pp. 37-39.
  • Schneider et al., “Nevis Synchrocyclotron Conversion Program—RF System,” IEEE Transactions on Nuclear Science USA, Jun. 1969, ns 16(3): 430-433.
  • Schneider et al., “Superconducting Cyclotrons,” IEEE Transactions on Magnetics, vol. MAG-11, No. 2, Mar. 1975, New York, pp. 443-446.
  • Schreuder et al., “The Non-orthogonal Fixed Beam Arrangement for the Second Proton Therapy Facility at the National Accelerator Centre,” Application of Accelerators in Research and Industry, American Institute of Physics, Proceedings of the Fifteenth International Conference, Nov. 1998, Part Two, pp. 963-966.
  • Schreuder, “Recent Developments in Superconducting Cyclotrons,” Proceedings of the 1995 Particle Accelerator Conference, May 1-5, 1995, vol. 1, pp. 317-321.
  • Schubert and Blosser, “Conceptual Design of a High Field Ultra-Compact Cyclotron for Nuclear Physics Research,” Proceedings of the 1997 Particle Accelerator Conference, May 12-16, 1997, vol. 1, 3 pp. 1060-1062.
  • Schubert, “Extending the Feasibility Boundary of the Isochronous Cyclotron,” Dissertation submitted to Michigan State University, 1997, Abstract http://adsabs.harvard.edu/abs/1998PhDT . . . 147S.
  • Shelaev et al., “Design Features of a Model Superconducting Synchrotron of JINR,” Proceedings of the 12th International Conference on High-energy Accelerators, Aug. 11-16, 1983, pp. 416-418.
  • Shintomi et. Al, “Technology and Materials for the Superconducting Super Collider (SSC) Project,” [Lang.: Japanese], The Iron and Steel Institute of Japan 00211575, 78(8): 1305-1313, 1992, http://ci.nii.ac.jp/naid/110001493249/en/.
  • Sisterson, “World Wide Proton Therapy Experience in 1997,” The American Insitute of Physics, Applications of Accelerators in Research and Industry, Proceedings of the Fifteenth International Conference, Part Two, Nov. 1998, pp. 959-962.
  • Sisterson, “Clinical use of proton and ion beams from a world-wide perspective,” Nuclear Instruments and Methods in Physics Research, Section B, 1989, 40-41:1350-1353.
  • Slater et al., “Developing a Clinical Proton Accelerator Facility: Consortium-Assisted Technology Transfer,” Conference Record of the 1991 IEEE Particle Accelerator Conference: Accelerator Science and Technology, vol. 1, May 6-9, 1991, pp. 532-536.
  • Slater et al., “Development of a Hospital-Based Proton Beam Treatment Center,” International Journal of Radiation Oncology Biology Physics, Apr. 1988, 14(4):761-775.
  • Smith et al., “The Northeast Proton Therapy Center at Massachusetts General Hospital” Journal of Brachytherapy International, Jan. 1997, pp. 137-139.
  • Snyder and Marti, “Central region design studies for a proposed 250 MeV proton cyclotron,” Nuclear Instruments and Methods in Physics Research, Section A, 1995, vol. 355, pp. 618-623.
  • Soga, “Progress of Particle Therapy in Japan,” Application of Accelerators in Research and Industry, American Institute of Physics, Sixteenth International Conference, Nov. 2000, pp. 869-872.
  • Spiller et al., “The GSI Synchrotron Facility Proposal for Acceleration of High Intensity Ion and Proton Beams” Proceedings of the 2003 Particle Accelerator Conference, May 12-16, 2003, vol. 1, pp. 589-591.
  • Stanford et al., “Method of Temperature Control in Microwave Ferroelectric Measurements,” Sperry Microwave Electronics Company, Clearwater, Florida, Sep. 19, 1960, 1 page.
  • Tadashi et al., “Large superconducting super collider (SSC) in the planning and materials technology,”78(8):1305-1313, The Iron and Steel Institute of Japan 00211575, Aug. 1992.
  • Takada, “Conceptual Design of a Proton Rotating Gantry for Cancer Therapy,” Japanese Journal of Medical Physics, 1995, 15(4):270-284.
  • Takayama et al., “Compact Cyclotron for Proton Therapy,” Proceedings of the 8th Symposium on Accelerator Science and Technology, Japan, Nov. 25-27, 1991, pp. 380-382.
  • Teng, “The Fermilab Tevatron,” Coral Gables 1981, Proceedings, Gauge Theories, Massive Neutrinos, and Proton Decay, 1981, pp. 43-62.
  • The Journal of Practical Pharmacy, 1995, 46(1):97-103 [Japanese].
  • Tilly, et al., “Development and verification of the pulsed scanned proton beam at The Svedberg Laboratory in Uppsala”, Physics in Medicine and Biology, Phys. Med. Biol. 52, pp. 2741-2454, 2007.
  • Tobias et al., Cancer Research,1958, 18, 121 (1958).
  • Tom, “The Use of Compact Cyclotrons for Producing Fast Neutrons for Therapy in a Rotatable Isocentric Gantry,” IEEE Transaction on Nuclear Science, Apr. 1979, 26(2):2294-2298.
  • Toyoda, “Proton Therapy System”, Sumitomo Heavy Industries, Ltd., 2000, 5 pages.
  • Trinks et. al., “The Tritron: A Superconducting Separated-Orbit Cyclotron,” Nuclear Instruments and Methods in Physics Research, Section A, 1986, vol. 244, pp. 273-282.
  • Tsuji, “The Future and Progress of Proton Beam Radiotherapy,” Journal of Japanese Society for Therapeutic Radiology and Oncology, 1994, 6(2):63-76.
  • UC Davis School of Medicine, “Unlikely Partners Turn Military Defense into Cancer Offense”, Current Issue Summer 2008, Sacramento, California, pp. 1-2.
  • Umegaki et al., “Development of an Advanced Proton Beam Therapy System for Cancer Treatment” Hitachi Hyoron, 2003, 85(9):605-608 [Lang.: Japanese], English abstract, http://www.hitachi.com/ICSFiles/afieldfile/2004/06/01/r2003—04—104.pdf or http://wwvv.hitachi.com/rev/archive/2003/2005649—12606.html (full text) [Hitachi, 52(4), Dec. 2003].
  • Umezawa et al., “Beam Commissioning of the new Proton Therapy System for University of Tsukuba,” Proceedings of the 2001 Particle Accelerator Conference, vol. 1, Jun. 18-22, 2001, pp. 648-650.
  • van Steenbergen, “Superconducting Synchroton Development at BNL,” Proceedings of the 8th International Conference on High-Energy Accelerators CERN 1971, 1971, pp. 196-198.
  • van Steenbergen, “The CMS, a Cold Magnet Synchrotron to Upgrade the Proton Energy Range of the BNL Facility,” IEEE Transactions on Nuclear Science, Jun. 1971, 18(3):694-698.
  • Vandeplassche et al., “235 MeV Cyclotron for MGH's Northeast Proton Therapy Center (NPTC): Present Status,” EPAC 96, Fifth European Partical Accelerator Conference, vol. 3, Jun. 10-14, 1996, pp. 2650-2652.
  • Vorobiev et al., “Concepts of a Compact Achromatic Proton Gantry with a Wide Scanning Field”, Nuclear Instruments and Methods in Physics Research, Section A., 1998, 406(2):307-310.
  • Vrenken et al., “A Design of a Compact Gantry for Proton Therapy with 2D-Scanning,” Nuclear Instruments and Methods in Physics Research, Section A, 1999, 426(2):618-624.
  • Wikipedia, “Cyclotron” http://en.wikipedia.org/wiki/Cyclotron (originally visited Oct. 6, 2005, revisited Jan. 28, 2009), 7pages.
  • Wikipedia, “Synchrotron” http://en.wikipedia.org/wiki/Synchrotron (originally visited Oct. 6, 2005, revisited Jan. 28, 2009), 7 pages.
  • Worldwide Patent Assignee Search, Jan. 24, 2005, 224 pages.
  • Worldwide Patent Keyword Search, Jan. 24, 2005, 94 pages.
  • Wu, “Conceptual Design and Orbit Dynamics in a 250 MeV Superconducting Synchrocyclotron,” Ph.D. Dissertation, Michigan State University, Department of Physics and Astronomy, 1990, 172 pages.
  • York et al., “Present Status and Future Possibilities at NSCL-MSU,” EPAC 94, Fourth European Particle Accelerator Conference, pp. 554-556, Jun. 1994.
  • York et al., “The NSCL Coupled Cyclotron Project—Overview and Status,”Proceedings of the Fifteenth International Conference on Cyclotrons and their Applications, Jun. 1998, pp. 687-691.
  • Yudelev et al., “Hospital Based Superconducting Cyclotron for Neutron Therapy: Medical Physics Perspective,” Cyclotrons and their applications 2001, 16th International Conference. American Institute of Physics Conference Proceedings, vol. 600, May 13-17, 2001, pp. 40-43.
  • Zherbin et al., “Proton Beam Therapy at the Leningrad Synchrocyclotron (Clinicomethodological Aspects and Therapeutic Results)”, Aug. 1987, 32(8):17-22, (German with English abstract on pp. 21-22).
  • International Search Report and Written Opinion from PCT application No. PCT/US2013/062119 mailed on Nov. 26, 2013 (9 pages).
  • International Preliminary Report on Patentability from PCT application No. PCT/US2013/062119 mailed on Apr. 9, 2015 (7 pages).
Patent History
Patent number: 9192042
Type: Grant
Filed: Sep 27, 2013
Date of Patent: Nov 17, 2015
Patent Publication Number: 20140091734
Assignee: Mevion Medical Systems, Inc. (Littleton, MA)
Inventors: Kenneth P. Gall (Harvard, MA), Stanley Rosenthal (Wayland, MA), Thomas C. Sobczynski (Arlington, MA), Adam C. Molzahn (Leominster, MA)
Primary Examiner: Jung Kim
Application Number: 14/038,967
Classifications
Current U.S. Class: Ion Or Electron Beam Irradiation (250/492.3)
International Classification: H05H 13/02 (20060101); A61N 5/10 (20060101); H05H 7/00 (20060101);