Dose Or Dose Rate Measurement Patents (Class 250/370.07)
  • Publication number: 20090057562
    Abstract: A method and an apparatus for measuring the dose, the dose rate and/or the composition of radiation is disclosed. In the method, a detector means is exposed to a radiation environment, the detector means comprising an array of radiation sensing detector elements. The detector means is switched in a sensitive state for the duration of a sensitive time period, and during said sensitive time period, an interaction pattern generated by individual radiation quanta interacting with one or more of the detector elements is recorded. The duration of the sensitive time period can be precisely adapted to the intensity of the radiation that has to be recorded. The interaction pattern is analyzed to distinguish individual radiation quanta received during the sensitive time period, and a radiation category is assigned to each of the distinguished radiation quanta based on its corresponding interaction pattern.
    Type: Application
    Filed: September 30, 2008
    Publication date: March 5, 2009
    Applicants: CERN-European Organization for Nuclear Research, Czech Technical University of Prague
    Inventors: Erik Henricus M. HEIJNE, Stanislav Pospisil
  • Publication number: 20090050814
    Abstract: A radiation sensor and a method for making the radiation sensor are described. An ionizing radiation sensitive area is formed in a radiation insensitive or hardened die. When the sensitive area is impacted by ionizing radiation, properties of the sensitive area change. For example, the changed property may be charge density, threshold voltage, leakage current, and/or resistance. Circuitry for measuring these property changes is located in a radiation hardened area of the die. As a result, a radiation sensor may be fabricated on a single die.
    Type: Application
    Filed: August 20, 2007
    Publication date: February 26, 2009
    Applicant: HONEYWELL INTERNATIONAL INC.
    Inventors: James D. Seefeldt, Jeffrey J. Kriz
  • Patent number: 7495224
    Abstract: Methods, systems, devices, and computer program products include positioning disposable single-use radiation sensor patches that have adhesive means onto the skin of a patient to evaluate the radiation dose delivered during a treatment session. The sensor patches are configured to be minimally obtrusive and operate without the use of externally extending power chords or lead wires.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: February 24, 2009
    Assignee: Sicel Technologies, Inc.
    Inventors: Steven R. Widener, John Carroll
  • Patent number: 7491942
    Abstract: Methods, systems, devices, and computer program products include positioning single-use radiation internal dosimeters with MOSFETs into a patient to evaluate the radiation dose delivered during a medical procedure or treatment session. The MOSFETs can be unpowered during irradiation.
    Type: Grant
    Filed: June 10, 2004
    Date of Patent: February 17, 2009
    Assignee: Sicel Technologies, Inc.
    Inventors: Robert D. Black, Steven R. Widener, John Carroll, Gregory Glenwood Mann, Phillip M. Lehman
  • Patent number: 7465937
    Abstract: A dosimeter for detecting high-energy neutron radiation having a neutron converter and a detection element is proposed which is characterized by the neutron converter comprising metal atoms which convert the energy of the neutrons into protons, alpha particles and other charged nuclei in a suitable energy range so that they are detectable.
    Type: Grant
    Filed: May 29, 2004
    Date of Patent: December 16, 2008
    Assignee: Gesellschaft für Schwerionenforschung mbH
    Inventor: Georg Fehrenbacher
  • Patent number: 7456405
    Abstract: A radiation measuring instrument implements an energy ratio technique that utilizes a ratio between a measured radiation count rate and a detected radiation dose rate to determine if an alarm should be signalled to an operator of the device of this invention. The radiation measuring instrument uses an “inorganic” scintillation or radiation detection material, such as a Thallium doped sodium iodide (NaI(TI)) material, which operates in relatively compact or small sizes to detect radiation. The radiation measuring instrument also uses a ratio of two measured parameters to detect gamma radiation from artificial (hidden) radioactive material where the parameters include (i.) a total number of counted or detected gamma particles and (ii.) a measured, detected, or otherwise derived gamma dose rate.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: November 25, 2008
    Assignee: Thermo Fisher Scientific Inc.
    Inventors: Michael Iwatschenko-Borho, Norbert Trost, Ralf Pijahn
  • Publication number: 20080272305
    Abstract: In a radiation detector, a response is approximated as a primary delay system, and when a time constant T indicating the characteristic of the response is known, a final response value N0 is forecasted from dose rates or counting rates N1 and N2 of two points in the initial or middle stage of response. When the time constant T is unknown, the final response value N0 is forecasted from dose rates or counting rates N1, N2, and N3 of three points in the initial or middle stage of response. Simultaneously, a time constant is obtained and the soundness of the radiation detector is also evaluated. Thereby, a dose rate in an existence field of radiation or a counting rate in an existence field of radioactive materials is quickly and accurately forecasted, whereby the measurement time is shortened.
    Type: Application
    Filed: February 16, 2006
    Publication date: November 6, 2008
    Applicants: National Institute of Radiological Sciences, Amano & Associates, Inc.
    Inventors: Yoshiyuki Shirakawa, Hiro Amano
  • Publication number: 20080128629
    Abstract: A method, device and system for monitoring ionizing radiation. The method including: collecting an ionizing radiation induced charge collected by the depletion region of a diode formed in a silicon layer below an oxide layer buried below a surface of a silicon substrate; and coupling a cathode of the diode to a precharged node of a clocked logic circuit such that the ionizing radiation induced charge collected by a depletion region of the diode will discharge the precharged node and change an output state of the clocked logic circuit.
    Type: Application
    Filed: February 11, 2008
    Publication date: June 5, 2008
    Inventors: Wagdi William Abadeer, Ethan Harrison Cannon, Dennis Thomas Cox, William Robert Tonti
  • Publication number: 20080121807
    Abstract: A radiation detector of the ?E-E type is proposed.
    Type: Application
    Filed: June 5, 2007
    Publication date: May 29, 2008
    Inventors: Giuseppina Valvo, Piero Giorgio Fallica, Stefano Agosteo, Alberto Fazzi
  • Patent number: 7378954
    Abstract: A safety indicator monitors environment conditions detrimental to humans e.g., hazardous gases, air pollutants, low oxygen, radiation levels of EMF or RF and microwave, temperature, humidity and air pressure retaining a three month history to upload to a PC via infra red data interface or phone link. Contaminants are analyzed and compared to stored profiles to determine its classification and notify user of an adversity by stored voice messages from, via alarm tones and associated flashing LED, via vibrator for silent operation or via LCD. Environmental radiation sources are monitored and auto-scaled. Instantaneous radiation exposure level and exposure duration data are stored for later readout as a detector and dosimeter. Scans for EMF allow detection with auto scaling of radiation levels and exposure durations are stored for subsequent readout. Electronic bugs can be found with a high sensitivity EMF range setting.
    Type: Grant
    Filed: October 21, 2005
    Date of Patent: May 27, 2008
    Inventor: Barry Myron Wendt
  • Patent number: 7375339
    Abstract: A method, device and system for monitoring ionizing radiation. The method including: collecting an ionizing radiation induced charge collected by the depletion region of a diode formed in a silicon layer below an oxide layer buried below a surface of a silicon substrate; and coupling a cathode of the diode to a precharged node of a clocked logic circuit such that the ionizing radiation induced charge collected by a depletion region of the diode will discharge the precharged node and change an output state of the clocked logic circuit.
    Type: Grant
    Filed: April 28, 2006
    Date of Patent: May 20, 2008
    Assignee: International Business Machines Corporation
    Inventors: Wagdi William Abadeer, Ethan Harrison Cannon, Dennis Thomas Cox, William Robert Tonti
  • Patent number: 7372942
    Abstract: A dosimeter is provided on or adjacent to a circuit board deployed in a radiation environment. The dosimeter may be read or output a value or values indicating radiation dosage over a period of time. The radiation dosage associated with the circuit board may be used for determining disposition of the circuit board, such as whether to reuse the circuit board as a spare part or otherwise dispose of the circuit board.
    Type: Grant
    Filed: March 28, 2005
    Date of Patent: May 13, 2008
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Douglas William Raymond, Carlos E. Medina
  • Publication number: 20080061245
    Abstract: A dosimetry device for charged particle radiation that can be exclusive of cables and connectors between substrates is provided. A plurality of first electrodes are formed on one surface of a printed circuit board, a second electrode substrate having a second electrode opposing each of the plurality of first electrodes through an ionized space is provided, and a signal processing circuit is provided on the other surface opposing the surface of the printed circuit board. The signal processing circuit includes at least one amplifying circuit, a plurality of integrating capacitors corresponding to the amplifying circuit for integrating charge at each corresponding one of the first electrodes, and at least one selector switch that switchably connects each of the integrating capacitors to the amplifying circuit. The printed circuit board may be a multi-layer printed circuit board.
    Type: Application
    Filed: March 5, 2007
    Publication date: March 13, 2008
    Applicant: Mitsubishi Electric Corporation
    Inventor: Yuichi Yamamoto
  • Patent number: 7342231
    Abstract: Pulse shape analysis determines if two radiations are in coincidence. A transducer is provided that, when it absorbs the first radiation produces an output pulse that is characterized by a shorter time constant and whose area is nominally proportional to the energy of the absorbed first radiation and, when it absorbs the second radiation produces an output pulse that is characterized by a longer time constant and whose area is nominally proportional to the energy of the absorbed second radiation. When radiation is absorbed, the output pulse is detected and two integrals are formed, the first over a time period representative of the first time constant and the second over a time period representative of the second time constant. The values of the two integrals are examined to determine whether the first radiation, the second radiation, or both were absorbed in the transducer, the latter condition defining a coincident event.
    Type: Grant
    Filed: June 27, 2006
    Date of Patent: March 11, 2008
    Inventors: William K. Warburton, Hui Tan, Wolfgang Hennig
  • Publication number: 20080001094
    Abstract: An array-based C-MOS sensor device is provided with a facility for on the basis of non-destructive cell readout generating a radiation dose-sensing signal. In particular, the facility is arranged for accessing a subset of multiple distributed C-MOS cells across the array and feeding by such accessed cells an algorithmic means for therein generating an overall feedback dose control signalization and/or an overall trigger signalization.
    Type: Application
    Filed: June 29, 2006
    Publication date: January 3, 2008
    Inventors: Alouisius Wilhelmus Marinus Korthout, Willem Johan De Haan, Adrianus Johannes Mierop
  • Patent number: 7265358
    Abstract: A device intended to reduce the risks of overexposure to harmful solar radiation. The device includes a detection arrangement, including at least one sensor sensitive to solar radiation, in particular UV. In addition, an arrangement is linked to the detection arrangement to generate a signal representing the quantity of radiation received by the detection means. An attachment arrangement is provided to attach the device to the head of a subject, such that the sensor(s) is (are) oriented in a substantially perpendicular manner to the vertical plane of the subject when the latter is active in the sun. The device is preferably configured in the form of a cap, with the detection arrangement arranged on a first visor intended to be positioned over the back of the individual's neck. The cap also preferably includes a second visor located opposite the first.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: September 4, 2007
    Assignee: L'Oreal
    Inventor: Michel Fontaine
  • Patent number: 7254214
    Abstract: An X-ray imaging device is equipped with a solid state detector, for recording image information by being irradiated with X-rays that bear image information and for outputting image signals that represent the recorded image information, and an X-ray dosage detector for detecting the dosage of irradiated X-rays. The X-ray dosage detector is provided between an X-ray source and the solid state detector, thereby enabling accurate measurement of the X-ray dosage, without being influenced by the solid state detector. In addition, the X-ray dosage detector is equipped with a photoconductive layer. Therefore, the X-ray dosage detector can be made thinner than conventional X-ray dosage detectors, which are constituted by a fluorescent plate, a light collecting field, a light transmitting plate, and a light shielding plate. Accordingly, decreases in resolution of images detected by the solid state detector can be prevented.
    Type: Grant
    Filed: October 21, 2004
    Date of Patent: August 7, 2007
    Assignee: Fujifilm Corporation
    Inventor: Takashi Shoji
  • Patent number: 7238949
    Abstract: The invention relates to a conductor crossover for a semiconductor detector, particularly for a drift detector for conducting X-ray spectroscopy. The conductor crossover comprises at least two doped semiconductor electrodes (2), which are placed inside a semiconductor substrate (1), at least one connecting conductor (M), which is guided over the semiconductor electrodes (2), and a first insulating layer (Ox). An intermediate electrode (L) is situated between the connecting conductor (M) and the first insulation layer (Ox). Said intermediate electrode overlaps the area of the semiconductor substrate (1) between the semiconductor electrodes (2) and is electrically insulated from the connecting conductor (M) by at least one additional insulation layer (I). The invention also relates to a drift detector equipped with a conductor crossover of this type and to a detector arrangement for conducting X-ray spectroscopy.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: July 3, 2007
    Assignee: Max-Planck-Gesellschaft zur Forderung der Wissenschaften E.V.
    Inventors: Lothar Struder, Gerhard Lutz, Rainer Richter
  • Patent number: 7231018
    Abstract: According to a radiation imaging apparatus, any separate AEC sensor need not be prepared. Additionally, the apparatus main body can be made compact. To accomplish this, the radiation imaging apparatus has a first optical conversion element that converts incident radiation into an electrical signal, and generates image information on the basis of the electrical signal output from the first optical conversion element. Below a portion that is aligned to the gap between the first optical conversion elements, a plurality of second optical conversion elements which detect the incident amount of the radiation from the gap are formed. Exposure control for the radiation or control of the optical conversion elements is executed on the basis of the detection result by the second optical conversion element.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: June 12, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiko Morii, Masakazu Morishita, Osamu Tsujii, Minoru Watanabe, Takamasa Ishii
  • Patent number: 7227152
    Abstract: A device to measure a radiation dose, in particular an x-ray radiation dose, which absorbs radiation and provides an absorption-conditional output signal representing a measurement for the dose, has at least one absorption structure disposed on a foil-like carrier, made from thin-film layers disposed on top of one another that form at least one thin-film diode structure that supplies the output signal.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: June 5, 2007
    Assignee: Siemens Aktiengesellschaft
    Inventors: Christoph Brabec, Martin Hoheisel
  • Patent number: 7223979
    Abstract: An improved radiation dosimeter device in an improved radiation dosimeter system provides a DC analog output voltage that is proportional to the total ionizing dose accumulated as a function of time at the location of the dosimeter in a host spacecraft, so as to operate in a system bus voltage range common to spacecraft systems with the output being compatible with conventional spacecraft analog inputs, while the total dose is measured precisely by continually monitoring the energy deposited in a silicon test mass accumulating charge including charge contribution prior to radiation threshold detection for improved measurement of the total accumulated charge with the dosimeters being daisy-chained and distributed about the spacecraft for providing a spacecraft dose profile about the spacecraft using the improved radiation dosimeter system.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: May 29, 2007
    Assignee: The Aerospace Corporation
    Inventors: William R. Crain, Jr., Dan J. Mabry, John Bernard Blake, Norman Katz
  • Patent number: 7217930
    Abstract: A dose detector includes a semiconductor radiation detector; a dose counter; and a check counter. The dose detector detects that the semiconductor radiation detector is outputting white noise even in a radiation shielded area and judges that the semiconductor radiation detector is working in a normal manner when dose count data from the dose counter is smaller than predetermined dose boundary data and check count data from the check counter is greater than predetermined lower limit checking data. The dose detector and a dosimeter provided with the dose detector are simple in structure and capable of checking a status of the semiconductor radiation detector safely.
    Type: Grant
    Filed: April 18, 2005
    Date of Patent: May 15, 2007
    Assignee: Fuji Electric Systems Co., Ltd.
    Inventors: Hironobu Kobayashi, Kei Aoyama
  • Patent number: 7208743
    Abstract: The invention relates to an instrument which uses an individual semi-conductive detector with special coverings as an essential sensor, and a method whereby the amplitude information of the signals from said semi-conductive detector are used to determine a person's dose in mixed neutron/photon-fields. Said instrument is highly sensitive and has a low energy dependency. It is possible for the dose to be read directly, and to emit a warning if the dose limit is exceeded. The inventive method enables a compact person's dose meter, which is immune to interference, to be produced with low power consumption.
    Type: Grant
    Filed: July 9, 2002
    Date of Patent: April 24, 2007
    Assignee: Bundesrepublik Deutschland, vertreten durch das Bundesministerium für Wirtschaft und Arbeit, dieses wiederum vertreten durch den Präsidenten der Physikalisch-Technischen Bundesanstalt
    Inventors: Marlies Luszik-Bhadra, Wilfried Wendt
  • Patent number: 7203278
    Abstract: A radiation exposure recording device and radiography method are disclosed, where the radiation exposure recording device includes a radiation exposure recording medium, a housing that at least partly surrounds the radiation exposure recording medium, and a first detector that detects a radiation exposure. An output signal produced in response to the detecting of the radiation exposure can be provided, and the detection of and output of a signal in response to the radiation exposure is entirely automatic and independent of any manual processing of the radiation exposure recording device. Further, the radiography method includes providing a first radiation exposure recording medium, providing a first radiation exposure detector, and sensing an exposure of radiation at the first radiation exposure detector. Also disclosed is a circuit that can be retrofitted to existing radiography cassettes for detecting when the cassettes are exposed to radiation.
    Type: Grant
    Filed: March 26, 2004
    Date of Patent: April 10, 2007
    Assignee: Wisconsin Alumni Research Foundation
    Inventors: Gary J. Wendt, Walter W. Peppler
  • Patent number: 7197404
    Abstract: The present system and method for simulating particles and waves is useful for calculations involving nuclear and full spectrum radiation transport, quantum particle transport, plasma transport and charged particle transport. The invention provides a mechanism for creating accurate invariants for embedding in general three-dimensional problems and describes means by which a series of simple single collision interaction finite elements can be extended to formulate a complex multi-collision finite element.
    Type: Grant
    Filed: March 1, 2004
    Date of Patent: March 27, 2007
    Inventor: Richard Andrew Holland
  • Patent number: 7157715
    Abstract: An improved radiation dosimeter device in an improved radiation dosimeter system provides a DC analog output voltage that is proportional to the total ionizing dose accumulated as a function of time at the location of the dosimeter in a host spacecraft, so as to operate in a system bus voltage range common to spacecraft systems with the output being compatible with conventional spacecraft analog inputs, while the total dose is measured precisely by continually monitoring the energy deposited in a silicon test mass accumulating charge including charge contribution prior to radiation threshold detection for improved measurement of the total accumulated charge with the dosimeters being daisy-chained and distributed about the spacecraft for providing a spacecraft dose profile about the spacecraft using the improved radiation dosimeter system.
    Type: Grant
    Filed: January 30, 2006
    Date of Patent: January 2, 2007
    Assignee: The Aerospace Corporation
    Inventors: William R. Crain, Jr., Dan J. Mabry, John Bernard Blake, Norman Katz
  • Patent number: 7115872
    Abstract: A radiation detector for dirty bomb and lost radioactive source detection applications is enclosed in a small pager-style housing made of impact resistant ABS plastic and epoxy binder composite which is relatively transparent to alpha, beta, gamma, fast neutron, and x-ray radiation, while also being optically opaque and providing a protective enclosure for the radiation detector components disposed inside the housing. The detector combines indirect radiation detection using a scintillator and photodiode and direct radiation detection by placing the photodiode and a high gain amplifier in the path of radiation. Semiconductors in these components generate an electrical signal from high energy radiation, whereby an alarm indicates the presence of the radiation.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: October 3, 2006
    Inventor: John William Bordynuik
  • Patent number: 7075090
    Abstract: A radiological imaging apparatus and method allows an operator to select between moving-picture imaging and still-picture imaging modes using the same apparatus so to provide radiological imaging having a picture quality equal to that of conventional radiological film imaging techniques but with a smaller, lighter and more compact equipment configuration. The apparatus employs photoelectric converters arranged in a two-dimensional matrix array for converting radiation into electrical signals, a read-out circuit for reading the signal output from the photoelectric converters, variable gain amplifiers upstream of an analog multiplexer and a buffer amplifier downstream of the multiplexer for outputting serially converted signals. The method involves setting the moving-picture mode gain Gf so as to be greater than the still-picture mode gain Gs, in order to obtain sharper images without exposing the subject to unnecessarily high levels of radiation.
    Type: Grant
    Filed: June 18, 2003
    Date of Patent: July 11, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tadao Endo
  • Patent number: 7053377
    Abstract: A dosimetry system having a solid-state dosimeter with one or more solid-state detectors for detecting radiation and an electrometer module with a circuit adapted to receive electrical impulses from the solid-state detectors, convert the impulses into a count and provide such count to a computer.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: May 30, 2006
    Assignee: Capintec, Inc.
    Inventor: Kevin J. Russell
  • Patent number: 7009184
    Abstract: An amplifying device for a sensor (10) delivering a response in voltage or impedance has a voltage controlling means for the sensor and at least an additional impedance (12). The voltage controlling means (22) is connected to output terminals (16, 20) of the sensor to maintain a noticeably constant voltage between the terminals. The additional impedance (12) is connected in series with the sensor within a polarization circuit, between the output terminals (18–16; 18–20) of the device. The amplifying device may be applied to temperatures, irradiation levels and pH measurement.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: March 7, 2006
    Assignee: Centre National de la Recherche Scientifique
    Inventors: Pierre Temple-Boyer, Gérard Sarrabayrouse, Augustin Martinez, Jérôme Launay
  • Patent number: 7009182
    Abstract: The invention relates to a pocket type digital radiation dosemeter comprising of a detector, which converts the ionisation in the detector caused by the incidence of ionising radiation of certain energy range into electrical impulses, a low power pulse amplifier, that amplifies the electrical pulses from the detector to detectable amplitudes, a discriminator circuit, that is used to reject pulses of origin other than those caused by the ionising radiation, a programmable divider circuit for calibrating the dosemeter, an electronic counting circuit and a six digit LCD display. The sensitivity of the dosemeter is 1 count per ?Sv (micro Sievert) and the accuracy is within ±15% from 60 keV to 1.25 Mev of X or Gamma radiation. A metallic energy compensation filter and a discriminator threshold modulation circuit are used to provide uniform response within ±15% from 60 KeV to 1.25 MeV.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: March 7, 2006
    Assignee: Department of Atomic Energy, Government of India
    Inventors: Subramaniam Kannan, Keshav Chander Bajaj, Madhuri Dilip Lalsare
  • Patent number: 7006598
    Abstract: According to a radiation imaging apparatus, any separate AEC sensor need not be prepared. Additionally, the apparatus main body can be made compact. To accomplish this, the radiation imaging apparatus has a first optical conversion element that converts incident radiation into an electrical signal, and generates image information on the basis of the electrical signal output from the first optical conversion element. Below a portion that is aligned to the gap between the first optical conversion elements, a plurality of second optical conversion elements which detect the incident amount of the radiation from the gap are formed. Exposure control for the radiation or control of the optical conversion elements is executed on the basis of the detection result by the second optical conversion element.
    Type: Grant
    Filed: August 7, 2003
    Date of Patent: February 28, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshiko Morii, Masakazu Morishita, Osamu Tsujii, Minoru Watanabe, Takamasa Ishii
  • Patent number: 6993376
    Abstract: A displacement difference dosimetry method is provided for use with in-vivo scintillating fiber radiation detectors. A scintillating fiber includes an insertion end which is incrementally inserted into a human body using a catheter or hypodermic needle to provide a fixed (but not necessarily known) insertion path. A photomultiplier tube is coupled to the other end of the scintillating fiber and detects both scintillation light and any Cerenkov light for each position of the scintillating fiber insertion end along the fixed insertion path. The change in the amount of light detected by the photomultiplier tube divided by the corresponding amount of change in position of the scintillating fiber insertion end gives a measure of the dose rate at the scintillation fiber tip which is substantially free from the effects of Cerenkov light.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: January 31, 2006
    Inventor: Louis R. Testardi
  • Patent number: 6963065
    Abstract: A normalization apparatus and method for a PET scanner with panel detectors for obtaining an estimate of a normalization array, for correction for count rate effects on the normalization array, and for measurement of the relation between the normalization array and the count rate. The method of the present invention is based on two quasi-independent radial and axial components, which are count rate dependent due to sensitivity changes across the detector blocks. A scatter source is disposed at the center of the FOV and a scatter-free source is disposed at the outer edge of the FOV. The method computes the normalization array through several steps which evaluate the geometric profile, the axial profile, and the correction factor. A count rate correction is introduced to extend the normalization array to any count rate.
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: November 8, 2005
    Assignee: CTI PET Systems, Inc.
    Inventors: Maurizio Conti, James J. Hamill, Michael E. Casey, Mu Chen
  • Patent number: 6894283
    Abstract: The invention relates to an arrangement with light-sensitive or X-ray-sensitive sensors which are arranged in rows and columns of a matrix and generate charges in dependence on the amount of incident radiation, each sensor including a photosensor element with an intrinsic storage capacitor and/or a storage capacitor connected parallel to its terminals, and also a respective transistor; it also includes at least one switching line for each row of sensors via which the transistors can be activated so that the charges of the relevant activated sensors S can be read out simultaneously via read-out lines 8 in order to ensure that, in conformity with the relevant mode of operation of the arrangement, the switching noise caused by the reading out of the sensors is reduced and/or a higher image repeat rate or more stable operating conditions for the photosensor element, also in the case of large signals, as well as an increase of the dynamic range of the photosensor element become possible in that each sensor S inclu
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: May 17, 2005
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Falko Busse, Michael Overdick, Walter Rütten, Martin John Powell
  • Patent number: 6847698
    Abstract: When a phototimer unit is used for exposure control, a deterioration in a S/N ratio occurs, and optimal exposure cannot be performed due to a deviation from a proper image sensing position and the like. Therefore, there is provided a radiation image sensing apparatus comprising an X-ray image sensing panel which is capable of non-destructive reading and adapted to sense an object image by allowing radiation from an X-ray source to pass through an object, and a control circuit adapted to perform control to stop emission of radiation from the X-ray source on the basis of a signal obtained from the X-ray image sensing panel by non-destructive reading in the image sensing operation.
    Type: Grant
    Filed: July 30, 2001
    Date of Patent: January 25, 2005
    Assignee: Canon Kabushiki Kaisha
    Inventors: Noriyuki Kaifu, Kazuaki Tashiro, Osamu Yuki
  • Patent number: 6828562
    Abstract: In a solid-state radiation detector and a medical examination and/or treatment device having such a solid-state radiation detector, the detector has a pixel matrix, with each pixel supplying an output signal dependent on the incident radiation. The pixel matrix has a conversion layer that converts the incident radiation into charge, a storage capacitor for storing the charge and a transistor for reading out the charge. The capacitance of the storage capacitor is set to be so small that because of the voltage drop across the storage capacitor, the output signal of the pixel exhibits, starting from a specific value of the incident radiation dose, a sublinear response with reference to the radiation dose.
    Type: Grant
    Filed: June 20, 2002
    Date of Patent: December 7, 2004
    Assignee: Siemens Aktiengesellschaft
    Inventor: Martin Hoheisel
  • Patent number: 6794630
    Abstract: A radiation measuring technique includes adjusting a threshold level of a radiation sensor in a radiation-measuring circuit and obtaining an output signal based on radiation dose sensed by the radiation sensor.
    Type: Grant
    Filed: December 17, 2001
    Date of Patent: September 21, 2004
    Assignee: Intel Corporation
    Inventors: Ali Keshavarzi, Jaume A. Segura, Vivek K. De
  • Patent number: 6762418
    Abstract: The invention is generally directed to methods of radiation processing and methods for routine dosimetry, such as for the measurement of radiation dosages delivered to items to be processed by the application of radiation. Radiation-induced heat in an irradiated item is measured with a calorimeter and used to determine the dose of radiation received by the item. Resistive elements such as thermistors may be used in calorimeters to measure the change in temperature of an item receiving radiation, such as in electron beam radiation. Calorimeters exposed to irradiation in the same manner as irradiated items provide routine dosimetry for radiation processing.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: July 13, 2004
    Assignee: Advanced Cardiovascular Systems, Inc.
    Inventors: Byron Lambert, Fuh-Wei Tang, Brian Riggs, Allen Coomber, Michael Volpone
  • Publication number: 20040129888
    Abstract: The invention relates to a pocket type digital radiation dosemeter comprising of a detector, which converts the ionisation in the detector caused by the incidence of ionising radiation of certain energy range into electrical impulses, a low power pulse amplifier, that amplifies the electrical pulses from the detector to detectable amplitudes, a discriminator circuit, that is used to reject pulses of origin other than those caused by the ionising radiation, a programmable divider circuit for calibrating the dosemeter, an electronic counting circuit and a six digit LCD display. The sensitivity of the dosemeter is 1 count per &mgr;Sv (micro Sievert) and the accuracy is within ±15% from 60 keV to 1.25 Mev of X or Gamma radiation. A metallic energy compensation filter and a discriminator threshold modulation circuit are used to provide uniform response within ±15% from 60 KeV to 1.25 MeV.
    Type: Application
    Filed: October 27, 2003
    Publication date: July 8, 2004
    Inventors: Subramaniam Kannan, Keshav Chander Bajaj, Madhuri Dilip Lalsare
  • Publication number: 20040041097
    Abstract: This invention is to provide a radiation image sensing apparatus capable of automatically adjusting an incident radiation dose without requiring high-speed driving while suppressing any attenuation of the radiation before detection, and a method of manufacturing the same. To accomplish this, a read TFT (1) is formed on an insulating substrate (11). The semiconductor layer (19) and n+-semiconductor layer (20) of an MIS photoelectric conversion element (2) are formed on a second insulating layer (18) that covers the read TFT (1) to be aligned with source and drain electrodes (16) functioning as lower electrodes. The semiconductor layer (21) of a TFT sensor (3) is formed to be aligned with a gate electrode (17) when viewed from the upper side. The semiconductor layers (19, 21) are formed from the same layer. The upper electrode (22) of the MIS photoelectric conversion element (2) is formed on the n+-semiconductor layer (20). Two ohmic contact layers (23) are formed on the semiconductor layer (21).
    Type: Application
    Filed: August 27, 2003
    Publication date: March 4, 2004
    Inventors: Takamasa Ishii, Minoru Watanabe
  • Patent number: 6630676
    Abstract: In a plane type radiation detector unit, a rotating shaft is provided on one end side of the detector unit and is attached to a fluoroscopic radiographing stand to hold the detector unit so that the detector unit can be rotated around the rotating shaft by 90° to widen a space in front of an object or patient to be tested. A plurality of slide electrodes is disposed on the rotating shaft to input or output signals to or from the detector unit, or to supply a power source. A detecting portion of the detector unit includes an X-ray converting layer, an active matrix board, a gate circuit portion and a reading circuit portion. The detecting portion is controlled by a control circuit portion to read pixel signals of the detecting portion to the reading circuit portion and send out data to an outside through the slide electrodes.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: October 7, 2003
    Assignee: Shimadzu Corporation
    Inventor: Takayuki Takemoto
  • Publication number: 20030085357
    Abstract: The present invention relates to a process and installation for simultaneously measuring the flux of ionizing radiation, of an energy greater than several kVe and the dose of radiation received by a body exposed to this radiation.
    Type: Application
    Filed: October 24, 2002
    Publication date: May 8, 2003
    Applicant: EURORAD 2-6 (SOCIETE ANONYME)
    Inventors: Anne Elisabeth Kazandjian, Claude Teissier
  • Patent number: 6510336
    Abstract: A device for locating radiopharmaceutical labeled diseased or malfunctioning candidate cells within a human body and a method for using the device. The method includes the labeling of target cells in a body with a radionuclide and the identification in situ of the candidate cells using a body insertable nuclear probe sensitive to the presence of the radionuclide label. More particularly, the invention relates to using a beta or gamma probe to locate labeled cells, also referred to as candidate cells while simultaneously generating an MRI image and/or a visual image. The device may also include attachments to the distal tip if the probe which allows the position of the tip within the body to be tracked and recorded or the aperture to be varied in size.
    Type: Grant
    Filed: March 3, 2000
    Date of Patent: January 21, 2003
    Assignee: Intra Medical Imaging, LLC
    Inventors: Farhad Daghighian, Russell Edward Walker, Barry J. Leon
  • Publication number: 20030010921
    Abstract: In a solid-state radiation detector and a medical examination and/or treatment device having such a solid-state radiation detector, the detector has a pixel matrix, with each pixel supplying an output signal dependent on the incident radiation. The pixel matrix has a conversion layer that converts the incident radiation into charge, a storage capacitor for storing the charge and a transistor for reading out the charge. The capacitance of the storage capacitor is set to be so small that because of the voltage drop across the storage capacitor, the output signal of the pixel exhibits, starting from a specific value of the incident radiation dose, a sublinear response with reference to the radiation dose.
    Type: Application
    Filed: June 20, 2002
    Publication date: January 16, 2003
    Inventor: Martin Hoheisel
  • Patent number: 6501083
    Abstract: Methods are disclosed for calculating cumulative exposure energy from a microlithography reticle, especially a reticle used for charged-particle-beam (CPB) microlithography. The methods provide an accuracy of results at least as high as conventional methods, but the subject methods can be performed using substantially less calculation time, even for complex patterns. The pattern features contained within a region and/or one or more size parameters of the region are evaluated according to specified rules. The region also is subdivided according to the specified rules. Subdivision produces subregions that also are evaluated according to the rules to determine whether to subdivide further or to cease further subdivision. The result is a branching structure for the region, containing multiple levels of subregions arranged in an hierarchical manner. As a result, e.g.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: December 31, 2002
    Assignee: Nikon Corporation
    Inventor: Koichi Kamijo
  • Patent number: 6388250
    Abstract: A personal radiation dosemeter comprising a radiation detector means coupled to an electronic measurement circuit arranged in combination therewith to generate signals representative of an amount of radiation detected by the radiation detector. The radiation detector means is arranged to be screened from ambient light and is further provided with a light source optically coupled to the radiation detector and arranged to operate under control of a test control circuit to generate light of a wavelength which may be detected by said radiation detector. This arrangement provides, in combination with said electronic measurement circuit an integrity test for said radiation detector means.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: May 14, 2002
    Assignees: Siemens Plc, Chiyoda Technol Corporation
    Inventors: William Frederick Croydon, Robert James Heath, Stewart Melville Bowen
  • Publication number: 20020040968
    Abstract: Methods for quantifying the irradiation dose received by an item or items, such as food items and medical items, undergoing irradiation-based sterilization, includes the steps of monitoring a selected electronic parameter associated with an economic single use sensor positioned adjacent the item or items and telemetrically relaying data associated with the monitored electronic parameter to a computer. The computer includes a computer program which is configured to determine the radiation dose received by the item or items by correlating the value of the monitored electronic parameter to a corresponding amount of radiation associated with the value. Related sensors and systems are also described.
    Type: Application
    Filed: July 31, 2001
    Publication date: April 11, 2002
    Inventors: Robert D. Black, Gregory Glenwood Mann, Steven R. Widener
  • Patent number: 6333505
    Abstract: A dark current component included in an image signal output from a detector of optical reading type is reduced in a radiation image data obtaining method and apparatus using the detector. A detector having radiation-insensitive areas at both ends of a stripe electrode outside an image area along the longitudinal direction thereof is used. An image signal output from a current detection amplifier is converted into image data having digital values by an A/D converter and input to a memory. A correction data calculation circuit finds correction data gradually decreasing from a starting area to the ending area of vertical scan in accordance with each position of each element along the longitudinal direction thereof, based on image data of the insensitive areas corresponding to the scan starting and ending areas. For each element, a subtraction circuit subtracts the correction data from image data of an image area.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: December 25, 2001
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Toshitaka Agano
  • Patent number: 6323490
    Abstract: An X-ray semiconductor detector has a pixel array structure in which a plurality of pixel elements are arrayed in a matrix. Each pixel element includes an X-ray/charge conversion film for generating charges in accordance with an incident X-ray, a storage capacitor for storing the signal charges generated in the X-ray/charge conversion film, a signal read transistor for reading the signal charges from the storage capacitor, and a protective diode arranged to remove excessive charges from the storage capacitor and prevent dielectric breakdown of the signal read transistor. The protective diode is arranged below the storage capacitor. Since the protective diode is arranged below the storage capacitor, it does not decrease the pixel density. Since the protective diode is covered with the storage capacitor, it can be shielded from an X-ray. Therefore, variations in OFF current of the protective diode by an X-ray and dielectric breakdown of the protective diode can be prevented.
    Type: Grant
    Filed: March 19, 1999
    Date of Patent: November 27, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsushi Ikeda, Manabu Tanaka, Masaki Atsuta, Akira Kinno, Kohei Suzuki, Norihiko Kamiura