Abstract: An amplifier assembly includes an input signal determiner that determines a first input signal and a second input signal based on an initial signal having an amplitude and an initial frequency. Amplifiers amplify the first and second input signal to form first and second output signals having a phase offset with respect to one another. The first and second amplified output signals are fed to a common coupling element that forms a useful signal and a loss signal, such that a total power of the useful signal and loss signal is independent of the phase offset, the power of the useful signal has a maximum corresponding to a predetermined value of the phase offset, and the partial power of the useful signal decreases with a deviation of the phase offset from the predetermined value.

Abstract: An RF resonator cavity for accelerating charged particles comprises an RF resonator cavity in which an electromagnetic RF field acts on a particle beam which passes through the RF resonator cavity along a beam path, and at least one intermediate electrode arranged in the RF resonator cavity along the beam path of the particle beam, the intermediate electrode increasing an electrical breakdown resistance in the resonator cavity. An accelerator for accelerating charged particles, which includes such RF resonator cavity, is also provided.

Abstract: A method for correcting image artifacts during the acquisition of magnetic resonance imaging data includes the following steps. At least one part of the linear, location-dependent and spatially constant interference fields arising at the measurement location is determined in a time interval between an excitation point in time and a MR data acquisition point in time.

Abstract: A particle accelerator may include at least one accelerator cell and a power supply device. The power supply device may provide electrical energy to the accelerator cell via a feed line. With electrical energy received via the feed line, the accelerator cell may generate an electric field for accelerating an electrically charged elementary particle. The power supply device may have a DC current source and a switch arrangement. The power supply device may be designed such that electrical energy provided by the DC circuit source is capacitively buffered, and upon corresponding actuation of the switch arrangement, is provided to the acceleration cell. The switch arrangement may be disposed near the acceleration cell such that the switch arrangement is exposed to ionizing radiation generated by the particle accelerator at least during operation. The DC circuit source may be connected to the switch arrangement via a first cable.

Abstract: A cascade accelerator (1), with two sets (2, 4) of capacitors (26, 28) which are each connected in series, interconnected by diodes (24, 30) in the form of a Greinacher cascade (20), is to have in a compact construction a particularly high attainable particle energy. Therefore, the cascade accelerator has an acceleration channel (8) which is formed through openings in the electrodes of the capacitors of a set (2), directed to a particle source (6) arranged in the region of the electrode with the highest voltage (12), wherein the electrodes are insulated to each other apart from the acceleration channel (8) with a solid or liquid insulation material (14).

Abstract: In a method for producing a time raster-adapted measurement sequence that can be executed directly in the time raster of a magnetic resonance (MR) scanner, for a measurement sequence composed of a series of time slices that in their entirety represent the measurement sequence, the predetermined time slices are not necessarily of a suitable length in order to be directly translated into the time raster of the MR scanner. The method according to the invention produces this conversion automatically and additionally ensures that global properties of the measurement sequence are maintained. The method simplifies the programming of measurement sequences for MR. Moreover, the method is a requirement for the direct use of timing values determined by a solver. The method can be executed by a computerized device and can be implemented in the form of programming instructions encoded in a computer-readable medium.

Abstract: An object (8) is x-rayed using one or more x-ray pulses in successive timed intervals. On volume elements of the object (8), in a direction different from the x-ray direction, the scattered x-ray radiation is recorded in a time and spatially resolved manner by way of an x-ray detector (9) using a two-dimensional arrangement of detector elements. By way of the known geometry and propagation of the wave front of the x-ray pulses, an image data record of a three-dimensional scatter distribution of the object (8) is reconstructed from the spatially and time-resolved measurement data. The method enables the creation of an image data record of the three-dimensional scattered radiation distribution using only one x-ray pulse and can thus be carried out very easily.

Abstract: The invention specifies a radiation collimator, in particular an x-ray collimator, which can be arranged between a radiation source outputting radiation and an object. The radiation collimator includes absorber channels arranged adjacent to one another which form a two-dimensional collimator aperture in the form of a matrix and a first absorber element arranged in the absorber channel. The first absorber element blocks the radiation in a first position and allows the radiation at least partially through the absorber channel in at least one second position. The first absorber element is rod-shaped and can be moved in the absorber channel by a rotation about its longitudinal axis and/or by a longitudinal and/or transverse displacement from the first into the at least one second position. This is advantageous in that the two-dimensional collimator aperture can be modulated easily, rapidly and with high resolution.

Abstract: In a method and a device for optimization of a combined system for the acquisition of magnetic resonance tomographic measurement data and an image reconstruction process, the image reconstruction process is already executed during the acquisition of the measurement data, by the calculation process being deconstructed into calculation packets, and rules are defined that establish which requirements must be met for the execution of the respective calculation packet. The calculation process is reorganized into a workflow structure based on the calculation packets and the rules. The calculation process is controlled using the generated workflow structure synchronized to the acquisition process. The rules entirely describe the calculation process, i.e. inclusive of all calculation packets and their logical dependencies. The stability of the calculation process is thus entirely independent of the chronological order of the measurement data acquisition.

Abstract: A radiant tube (4) for guiding a charged particle stream (10) has a hollow cylindrical isolation core (6) directly encompassing a beam-guiding hollow volume (8). The isolation core (6) is formed from a dielectrically acting carrier substrate (14) and an electrical conductor (16) held therein. The conductor (16) is divided into a plurality of conductor loops (20) completely encompassing the circumference of the isolation core (6) at different axial positions of the isolation core (6). The conductor loops (20) are galvanically connected to each other.

Abstract: A medical examination and/or treatment device has an apparatus for detecting the movement of at least one part of the body of an examination subject that changes its space coordinates periodically or aperiodically, wherein the apparatus includes at least one transmitter (8) transmitting the FMCW signal and at least one receiver (11) for receiving the FMCW signal reflected by the moving part of the body and is embodied for determining (3) the movement-induced changes in the space coordinates of the part of the body from the frequency shift of an FMCW signal reflected by the part of the body.

Abstract: The invention relates to a combined radiation therapy and magnetic resonance unit. For this purpose, in accordance with the invention a combined radiation therapy and magnetic resonance unit is provided comprising a magnetic resonance diagnosis part with an interior, which is limited in radial direction by a main magnet, and a radiation therapy part for the irradiation of an irradiation area within the interior, wherein at least parts of the radiation therapy part, which comprise a beam deflection arrangement, are arranged within the interior.

Abstract: A medical examination and/or treatment apparatus having an apparatus for position acquisition assigned to a control facility has at least one transmitter that is disposed on a movable part that can be controlled by way of the control facility and transmits a signal and at least one receiver disposed on the movable part for receiving a signal reflected by an external object, the apparatus for position acquisition being configured to determine the distance of the external object from the at least one movable part from the transmitted and received signal, wherein the signal is an FMCW signal of a predefined frequency or frequency range.

Abstract: In a contacting system and method for contacting magnetic resonance local coils with a unit for additional signal processing of a magnetic resonance data acquisition unit, a number of coil coupler elements are electrically connected with the magnetic resonance local coils and apparatus coupler elements are mounted at the magnetic resonance tomograph, and are electrically connected with a unit for signal processing. The coil coupler elements and the apparatus coupler elements are fashioned so that, given a movement of the local coils along a movement path in the magnetic resonance data acquisition unit, a successive contacting of at least a portion of the coil coupler elements with apparatus coupler elements ensues at least over a specific path segment of the movement.

Abstract: An accelerator for accelerating charged particles has a plurality of delay lines (13, 15) that are directed at a beam trajectory (35) and that are disposed in succession in the direction of the beam trajectory (35), wherein at least some of the delay lines (13, 15) are rotated with respect to one another relative to the beam trajectory (35).

Abstract: An accelerator for accelerating charged particles has at least two delay lines having different delays, wherein the at least two delay lines have an input side into which electromagnetic waves can be conducted for producing an accelerating electric potential, wherein the input side of the delay lines is designed to reflect electromagnetic waves, and the accelerating electric potential can be produced at least partially by the waves reflected at the input side. In a method for operating an accelerator, which comprises at least two delay lines having different delays, the at least two delay lines have an input side into which electromagnetic waves can be conducted for producing an accelerating electric potential, wherein the electromagnetic waves conducted into the delay lines are reflected at the input side, and the accelerating electric potential can be produced at least partially by the waves reflected at the input side.

Abstract: A magnetic resonance apparatus has a basic field magnet that generates a basic magnetic field with a homogeneity region of the basic magnetic field in which the basic magnetic field is homogeneous and with a maximum real measurement volume contained in the homogeneity region. The apparatus has a movable patient bed and a control unit that controls the movable patient bed. The maximum measurement volume thereby exhibits a cylindrical shape. A virtual total measurement volume that is greater than the maximum real cylindrical measurement volume can be generated by the control unit together with the movable patient bed.

Abstract: A magnetic resonance sequence model that is a formal description of a measurement sequence is used to automate measurement sequence programming. The sequence model allows a system-independent specification of the measurement sequence for execution in a magnetic resonance scanner. The sequence model is as formal as possible; it is limited to the minimum required information for description of a measurement sequence without limiting the flexibility in the sequence programming. A method for formal description of the measurement sequence describes the measurement sequence by a number of parameters to be parameterized. The parameterization of the measurement sequence can ensue automatically from the formalized description of the measurement sequence, except for a set of parameters that are still be determined.

Abstract: The invention specifies a radiation collimator, in particular an x-ray collimator, which can be arranged between a radiation source outputting radiation and an object. The radiation collimator includes absorber channels arranged adjacent to one another which form a two-dimensional collimator aperture in the form of a matrix and a first absorber element arranged in the absorber channel. The first absorber element blocks the radiation in a first position and allows the radiation at least partially through the absorber channel in at least one second position. The first absorber element is rod-shaped and can be moved in the absorber channel by a rotation about its longitudinal axis and/or by a longitudinal and/or transverse displacement from the first into the at least one second position. This is advantageous in that the two-dimensional collimator aperture can be modulated easily, rapidly and with high resolution.

Abstract: In a method for producing a time raster-adapted measurement sequence that can be executed directly in the time raster of a magnetic resonance (MR) scanner, for a measurement sequence composed of a series of time slices that in their entirety represent the measurement sequence, the predetermined time slices are not necessarily of a suitable length in order to be directly translated into the time raster of the MR scanner. The method according to the invention produces this conversion automatically and additionally ensures that global properties of the measurement sequence are maintained. The method simplifies the programming of measurement sequences for MR. Moreover, the method is a requirement for the direct use of timing values determined by a solver. The method can be executed by a computerized device and can be implemented in the form of programming instructions encoded in a computer-readable medium.