Abstract: An emission tomography detector module and an emission tomography scanner are disclosed. In at least one embodiment, the emission tomography detector modules includes a scintillator to capture an photon, the scintillator emitting a scintillating light on capturing the photon; a first type of solid-state photodetector to detect the scintillating light; and a second type of solid-state photodetector to detect the scintillating light, wherein the first type of solid-state photodetector and the second type of solid-state photodetector are different with respect to a detecting property.

Abstract: In a device and a method to determine SAR for a magnetic resonance tomography transmission system with multiple antenna elements, a single-column cross-correlation matrix of an antenna element matrix of antenna element values of multiple antenna elements of the magnetic resonance tomography transmission system is determined for each of multiple points in time or time periods. These single-column cross-correlation matrices are added into a sum cross-correlation matrix over a summation time period and the sum cross-correlation matrix is multiplied with a hotspot sensitivity matrix. The hotspot sensitivity matrix represents the sensitivities in at least one direction at a number of hotspot points in a subject located in the magnetic resonance tomography transmission system. The product of the sum cross-correlation matrix and the hotspot sensitivity matrix is multiplied with a value representing the dielectricity at least one hotspot point in order to determine a respective SAR value for hotspot points.

Abstract: A control device for a magnetic resonance system activates the coils of a transmission array and a gradient magnet system of the magnetic resonance system by causing an excitation pulse to be supplied to each coil. A magnetization that exhibits a first actual inhomogeneity thereby is generated in an excitation volume of the magnetic resonance system. The control device determines the excitation pulse for each coil using a start pulse and a maximum allowable inhomogeneity. The respective start pulse has a total time duration. When the control device activates the coils of the transmission array and of the gradient magnet system corresponding to the start pulse, a magnetization that exhibits a second actual inhomogeneity that is smaller than the maximum permissible inhomogeneity is generated in the excitation volume.

Abstract: An arrangement to transmit magnetic resonance signals has at least two reception branches. Each reception branch contains a single antenna of a local coil as well as an amplifier connected with the single antenna, such that an amplified magnetic resonance signal is formed from a magnetic resonance signal that is acquired via the single antenna. In a multiplexer, each input is connected with a respective reception branch, such that the amplified magnetic resonance signals of the reception branch are combined by the multiplexer into a resulting signal using a time multiplexing method. A transmission path is connected on one side with an output of the multiplexer and on the other side with a receiver, such that the resulting signal is transmitted from the multiplexer to the receiver via the transmission path.

Abstract: A circulator has a ferrite, and the circulator is arranged in the vicinity of a device that produces a static magnetic field in the environment surrounding the device, this static magnetic field giving the circulator a non-reciprocal behavior, with respect to circulation of energy among the gates of the circulator, as a result of interaction of the ferrite with the static magnetic field. A magnetic resonance apparatus embodies such a circulator, and the basic field magnet of this magnetic resonance apparatus generates the static magnetic field.

Abstract: In a magnetic resonance imaging apparatus and method, radio frequency signals are radiated into an examination subject and/or received from the examination subject by an array of radio frequency coils that completely encircles the examination subject, and that is located at a distance from the examination subject out of contact with the examination subject.

Abstract: A feed circuit accepts a stream of digital payload data and inserts it at predetermined first positions into a stream of digital transmission data. The feed circuit generates supplementary digital data using the stream of digital payload data and inserts it at predetermined second positions into a stream of digital transmission data. The feed circuit feeds the digital transmission data into a transmission medium. Said circuit determines the supplementary digital data in such a way that at least one frequency's portion of a frequency spectrum of the stream of digital transmission data will be minimized.

Abstract: An arrangement to transmit magnetic resonance signals has a local coil composed of a number of individual antennas for acquisition of radio-frequency signals of a magnetic resonance examination. Preamplifiers amplify the radio-frequency signals, and a transmission device transmits the radio-frequency signals from the local coil to the preamplifiers. The transmission device is fashioned as a readout coil and has a number of individual antennas. The individual antennas of the readout coil are magnetically coupled with the individual antennas of the local coil, with the individual antennas of the local coil and the individual antennas of the readout coil forming a linear MIMO transmission system describable by a transmission matrix.

Abstract: An amplifier device for a mode antenna has a number of amplifiers and a number of outputs. An input signal is fed to each amplifier, which is amplified by the respective amplifier into an amplified input signal. The amplified input signals are fed to an output matrix arranged after the amplifiers. Respective output signals are emitted by the output matrix at the outputs. The output matrix causes each amplified input signal to supply an output signal contribution for each output signal. Each output signal contribution of each output signal has an output-side contribution offset in relation to the corresponding amplified input signal, which depends on the amplified input signal that supplied the output signal contribution, and the output signal to which the output signal contribution contributes. The amplifier device is especially able to be used in a transmit arrangement for radio-frequency signals.

Abstract: In a method and device for monitoring a radio-frequency transmit device of a magnetic resonance tomography system, having a transmitter antenna system that has a number of transmit channels, during a magnetic resonance measurement of an examination subject, a reference scattering parameter matrix of the transmitter antenna system is determined in the unloaded state, and a subject-specific scattering parameter matrix of the transmitter antenna system is determined in a state loaded with the subject of examination. Moreover, transmitter amplitude vectors are determined in time-dependent fashion that represent the radio-frequency voltage amplitudes on the individual transmit channels. On the basis of the subject-specific scattering parameter matrix, the reference scattering parameter matrix, and the transmit amplitude vectors, radio-frequency power values absorbed at particular transmit times in the subject are determined.

Abstract: In a method and device for the transmission of a multiplicity of signals having different frequencies between a base station and a module situated at a location remote from the base station via a single, common cable connection, some of the signals being transmitted from the electronic assembly to the module and, in general simultaneously, the remaining signals are transmitted in the opposite direction. Each of the base station and the module has bandpass filter bank therein having a multiplicity of bandpass filters, the number thereof being a function of the number of channels to be transmitted, with which the respectively received signals are spectrally separated from one another so that they are available for further signal processing in the base station, or for further use in the module.

Abstract: An amplifier circuit has a transistor element that has an input terminal, an output terminal) and a third terminal. An input signal to be amplified is supplied to the input terminal. The amplified input signal is emitted as an output signal at the output terminal. The input terminal is connected with the output terminal via a first reactance. The third terminal is connected via a second reactance with a zero potential. One of the reactances is fashioned as an inductor and the other of the reactances is fashioned as a capacitor. An inductance value of the inductor and a capacitance value of the capacitor are dimensioned such that the quotient of the inductance value of the inductor and the capacitance value of the capacitor is equal to the product of a desired input impedance that is effective at the input terminal and an output impedance associated with the output impedance.

Abstract: A two port parametric amplifier has a first port that receives an input signal to be amplified and upconverted and a second port that receives a local oscillator signal. The amplified upconverted input signal is emitted as an output at upper and lower sideband frequencies. The amplifier further has a pair of varactor diodes connected between the first port and the second port. The diodes are connected in parallel from the first port and in series from the second port.

Abstract: A wireless magnetic resonance imaging (MRI) scanner bore tube assembly has a radio frequency (RF) antenna, a microwave antenna array and an electrical screen. The RF antenna is formed of a series of RF antenna elements, each comprising a rung. The rungs are spaced at intervals of substantially half of the wavelength of the frequency of operation of the microwave antenna array. The microwave antenna array is formed by a series of microwave antenna elements interleaved between the rungs and the screen acts as a reflector to reflect signals from the microwave antenna elements towards the centre of the bore tube.

Abstract: A wireless magnetic resonance imaging scanner has one or more local coils, a microwave antenna array, and a local oscillator, and an upconverter. The local oscillator signal from the local oscillator is transmitted from the microwave antenna array to illuminate the local coils. The local coils generate magnetic resonance signals at a first frequency and the magnetic resonance signals at the first frequency are upconverted in the upconverter to microwave frequencies. The local oscillator operates at a frequency within an unlicensed band, chosen such that desired sidebands for reception of the upconverted local coil magnetic resonance signals fall outside the unlicensed band.

Abstract: A method and a facility are disclosed for imaging a PET spectrum with a PET detector, especially a PE-MR tomograph, and evaluation of the PET spectrum. To improve the correction of the base line in PET and thereby to improve the energy resolution for the PET images, at least one embodiment of the facility includes: a sampling facility for sampling the output signal of the PET detector at a predetermined sampling rate; an edge discriminator for recognizing at least one edge of a PET pulse; a background signal discriminator for estimating a background signal under the PET pulse; and an integrator device for determining the energy of the PET pulse in the PET spectrum above of the background signal from the sample values of the sampling facility.

Abstract: A method and a transmission system are disclosed for the transmission of wanted signals between a sensor and an evaluation unit. In order to suppress interference to the sensor signals due to external interference sources as far as possible, at least one embodiment of the inventive system has at least one signal receiver with the sensor for detecting a wanted signal and a signal processing device for conditioning the wanted signal, at whose output a mixed signal with a wanted signal component and an interference signal component from at least one interference source are present; an interference source signal input for detecting at least one interference source signal of the at least one interference source; a filter device for reconstructing the interference signal component as a function of the at least one interference source signal; and a subtractor for eliminating interference superimposed on the wanted signal.

Abstract: A method is disclosed for determining positron emission measurement information in the context of positron emission tomography. The method includes carrying out a positron emission measurement, in a body area of a subject to be examined, to record positron emission measurement information with point resolution and determining a time frame of the measurement by, at the same time, generating images of the body area to be examined with a relatively higher time resolution and with point-resolved image data, using a second imaging method. Further, a local shift of points of individual images of the second imaging method is determined, caused by movement processes of the subject to be examined, and as a function thereof, of the positron emission measurement information for at least a part of the measurement period and of the body area to be examined. Finally, the positron emission measurement information is adjusted as a function of the determined shift.

Abstract: Example systems, apparatus, circuits, and so on described herein concern parallel transmission in MRI. One example apparatus includes at least two field effect transistors (FETs) that are connected by a coil that includes an LC (inductance-capacitance) leg. The apparatus includes a controller that inputs a digital signal to the FETs to control the production of an output analog radio frequency (RF) signal. The LC leg is to selectively alter the output analog RF signal and the analog RF signal is used in parallel magnetic resonance imaging (MRI) transmission.

Abstract: In a magnetic resonance apparatus having an RF radiating coil and gradient coils, and in a method for operating such a magnetic resonance apparatus, a pulse sequence, composed of multiple time steps, is specified for operating the gradient coils to time-dependently select regions of a selected slice of a selected volume of a subject. A non-linear equation system is then solved to obtain feed parameters for individual channels of the transmit coil for each time step, with specification of a desired target magnetization, and dependent on the pulse sequence specified for the gradient coils. The non-linear equation system is based on discrete values for time and space variable and, in addition to equations resulting from the Bloch equation, which are non-linear in their feed parameters, includes at least one additional equation that describes boundary conditions for the examination of the subject.