Abstract: A magnetic resonance system includes a magnet device, which is arranged in an outer housing and an inner housing located therein. A monitoring method includes determining a value of a vibration amplitude of the outer housing or an intermediate housing located between the inner housing and the outer housing at a vibration frequency; providing a transmission ratio between the vibration amplitude and the operating parameter at the vibration frequency; and determining a value of the operating parameter as a function of the determined value of the vibration amplitude by means of the transmission ratio.

Abstract: In a method and a magnetic resonance apparatus for generating movement information relating to an examination region of a patient, a reception circuit is provided that receives MR signals within a reception frequency range. An electromagnetic signal is generated that has a first frequency that is outside the reception frequency range of the reception circuit, and that interacts with at least some of the examination region, so the electromagnetic signal undergoes a modification. A modulated signal based on the modified first signal is generated that has a frequency within the reception frequency range. The modulated signal is transmitted to the reception circuit, and is forwarded to a computer, wherein movement information is determined based on the modulated signal.

Abstract: A magnetic resonance system includes a magnet device, which is arranged in an outer housing and an inner housing located therein. A monitoring method includes determining a value of a vibration amplitude of the outer housing or an intermediate housing located between the inner housing and the outer housing at a vibration frequency; providing a transmission ratio between the vibration amplitude and the operating parameter at the vibration frequency; and determining a value of the operating parameter as a function of the determined value of the vibration amplitude by means of the transmission ratio.

Abstract: In a method and a magnetic resonance apparatus for generating movement information relating to an examination region of a patient, a reception circuit is provided that receives MR signals within a reception frequency range. An electromagnetic signal is generated that has a first frequency that is outside the reception frequency range of the reception circuit, and that interacts with at least some of the examination region, so the electromagnetic signal undergoes a modification. A modulated signal based on the modified first signal is generated that has a frequency within the reception frequency range. The modulated signal is transmitted to the reception circuit, and is forwarded to a computer, wherein movement information is determined based on the modulated signal.

Abstract: A magnetic resonance tomography system is provided having a multichannel transmission system for generating signals to be transmitted for multiple transmit channels. The system includes devices for decoupling signals of different transmit channels from a transmit chain and applying signals decoupled from the transmit chain at inputs of a Butler matrix. The system includes a Butler matrix configured such that a combination of signals of different transmit channels applied at its inputs occurs such that the amplitude of Butler matrix output signals at outputs of the Butler matrix is a function of the relative phases that the phases of signals of different transmit channels have relative to each other at inputs of the Butler matrix. The Butler matrix output signals are applied at inputs of a monitoring unit configured to determine the relative phases of the signals on a basis of amplitudes of the Butler matrix output signals.

Abstract: A magnetic resonance device with at least one main field magnet and at least one gradient coil is provided. The magnetic resonance device provides more free space for the patient and treatment providers; the magnetic resonance device has at least one main field magnet, which is provided to generate a magnet volume. The magnet volume has an imaging region, which is displaced from the center of the main field magnet along a longitudinal axis defined by the main field magnet. The magnetic resonance device also has a gradient coil. In the direction of the longitudinal axis defined by the main field magnet, the gradient coil has a first side facing away from the main field magnet and a second side facing the main field magnet. The gradient coil has a cross-section with a larger area on the first side facing away than on the second facing side.

Abstract: The present embodiments relate to a device and a method for attenuating a high-frequency field of a magnetic resonance tomography system, where at least one attenuation element attenuating high-frequency fields is provided outside a magnetic resonance tomography field of view.

Abstract: A waveguide antenna assembly for a magnetic resonance tomography apparatus, particularly a waveguide antenna assembly that can be detuned for an operation with local coils, is composed of multiple metal surfaces connected by diodes respectively located between the metal surfaces. Only when the diodes are through-connected between these metal surfaces are the surfaces connected with one another in terms of RF signals via these diodes, so the assembly operates as a waveguide antenna. When the diodes are disabled between these metal surfaces, the surfaces are unconnected with one another for RF signals.

Abstract: The present embodiments relate to a device and a method for attenuating a high-frequency field of a magnetic resonance tomography system, where at least one attenuation element attenuating high-frequency fields is provided outside a magnetic resonance tomography field of view.

Abstract: In a method for adjustment of a B1 field in a magnetic resonance apparatus, the position of the measurement subject relative to a coordinate system is determined from a plurality of measurement subjects with a morphological magnetic resonance measurement. Respective tissue types of the measurement subject are determined using three-dimensional measurement subject data and a segmentation of the measurement subject into regions is effected using the tissue types having known dielectric properties. The segmentation and the association for all positions of the measurement subject are recorded for all subjects in respective entries of a database. A radio-frequency simulation for transmission coils is implemented with the entries of the database wherein electrical field distributions and/or B1 field distributions related to spatial elements are determined and are entered as results into the database, that is then used further magnetic resonance examinations.

Abstract: A waveguide antenna assembly for a magnetic resonance tomography apparatus, particularly a waveguide antenna assembly that can be detuned for an operation with local coils, is composed of multiple metal surfaces connected by diodes respectively located between the metal surfaces. Only when the diodes are through-connected between these metal surfaces are the surfaces connected with one another in terms of RF signals via these diodes, so the assembly operates as a waveguide antenna. When the diodes are disabled between these metal surfaces, the surfaces are unconnected with one another for RF signals.

Abstract: A method provides for inputting and storing data for a clinical study in a uniform manner by different study locations. Accordingly, the method comprises generation of an input platform program for an input of data of a clinical study, distribution of the input platform to input locations, calling up and activating the input platform program dependent on a participant characteristic linked with a study participant in the clinical study, inputting the data at an input location via an input platform generated by the input platform program, and storing the input data.

Abstract: In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time. Local exposure values are then determined on the basis of the amplitude values and phase values, respectively representing a physiological exposure that the radio-frequency pulses cause at the examination subject at a specific location at a specific time. Based on this, exposure control values are determined that are compared with predetermined exposure limit values.

Abstract: In a method for adjustment of a B1 field in a magnetic resonance apparatus, the position of the measurement subject relative to a coordinate system is determined from a plurality of measurement subjects with a morphological magnetic resonance measurement. Three-dimensionally associable measurement subject data are determined from the measurement subject. Respective tissue types of the measurement subject are determined using the three-dimensional measurement subject data and a segmentation of the measurement subject into regions is effected using the tissue types. Known dielectric properties are respectively associated with the tissue types. The segmentation and the association for all positions of the measurement subject are recorded in respective entries of a database, such that the database contains all entries of the measurement subjects.

Abstract: In a method and device for monitoring the physiologically effective radio-frequency exposure in at least one specific volume region of an examination subject in a magnetic resonance data acquisition scan in a magnetic resonance system, the magnetic resonance system having a radio-frequency antenna structure with a number of individually controllable radio-frequency signal channels for generation of radio-frequency field distributions in an examination volume including the examination subject, amplitude values are acquired that respectively represent, at specific acquisition points in time, a signal amplitude of the radio-frequency signals emitted or to be emitted via the radio-frequency signal channels in the course of the magnetic resonance measurement. Also, phase values are acquired that represent the phases of the appertaining radio-frequency signals at these points in time.

Abstract: A method provides for inputting and storing data for a clinical study in a uniform manner by different study locations. Accordingly, the method comprises generation of an input platform program for an input of data of a clinical study, distribution of the input platform to input locations, calling up and activating the input platform program dependent on a participant characteristic linked with a study participant in the clinical study, inputting the data at an input location via an input platform generated by the input platform program, and storing the input data.

Abstract: A head coil for a magnetic resonance apparatus has a mirror device for the stimulation of one or both eyes with first light in a first wavelength range and for simultaneous acquisition of a eye movement with second light in a second wavelength range in a functional magnetic resonance examination. The mirror device has a mirror that reflects the first light and is transmissive for the second light or that is transmissive for the first light and reflects the second light.

Abstract: In a method for correcting artifacts in magnetic resonance images that are caused, in a magnetic resonance device, by transverse magnetic field components that are oriented transverse to a basic magnetic field of the magnetic resonance device, wherein the magnetic resonance device has a gradient coil system for generating magnetic gradient fields and a high frequency transmitter for exciting magnetic resonance signals, during a measurement sequence a frequency correction value is fed to the high frequency transmitter for a correction area, this frequency correction value being determined dependent on the transverse magnetic field components, and/or an additional gradient field is produced for compensating the transverse magnetic field components.

Abstract: A head coil for a magnetic resonance apparatus has a mirror device for the stimulation of one or both eyes with first light in a first wavelength range and for simultaneous acquisition of a eye movement with second light in a second wavelength range in a functional magnetic resonance examination. The mirror device has a mirror that reflects the first light and is transmissive for the second light or that is transmissive for the first light and reflects the second light.

Abstract: In an active electrical device with an electrical line for operation in the examination volume of a nuclear spin tomography device, a sheath wave trap tuned to the operating frequency of the nuclear spin tomography device is installed in the line.