Abstract: A whole-body antenna for a magnetic resonance system has an antenna structure including at least one antenna rod extending in a longitudinal direction. The antenna rod can be charged with a transmission current to cause an excitation signal to be emitted that causes magnetic resonance signals to be excited in an examination subject arranged in an examination region. Microwave elements for emission of microwave signals into the examination region and/or for acquisition of microwave signals from the examination region are integrated into the first antenna rod on the side thereof facing toward the examination region. The microwave elements include antenna elements and circuit components associated with the antenna elements. The antenna elements are arranged on the side of the antenna rods facing toward the examination region. The circuit components are surrounded by the antenna rods both on the side thereof facing toward the examination region and on the side thereof facing away from the examination region.

Abstract: A magnetic resonance apparatus has an examination region to accommodate a patient to be examined, and a body coil that circumferentially encompasses the examination region and is designed for magnetic resonance examination of the patient. A gradient coil circumferentially encompasses the examination region and the body coil and is designed to detect the position of magnetic resonance measurement values. A basic field magnet is designed to form a basic magnetic field in the examination region for a patient examination to be conducted. The basic field magnet at least partially encompasses the examination region, the body coil and the gradient coil. A shim device is used that is designed to influence the basic magnetic field. Components of the shim device and components of the body coil are associated to exhibit a common distance relative to the longitudinal axis of symmetry of the examination region and thus encompass the examination region.

Abstract: A radio-frequency transmission system for a magnetic resonance system has a radio-frequency amplifier and a signal splitter with two inputs and two outputs. The signal splitter is fashioned so that the power of a radio-frequency signal provided at one of the two inputs is divided between the two outputs. A first input the two inputs of the signal splitter is thereby coupled with the output of the radio-frequency amplifier, and the two outputs of the signal splitter respectively serve for connection to different inputs of a transmission antenna of the magnetic resonance system in order to feed the output signals present at the two outputs of the signal splitter into the transmission antenna. The second input of the signal splitter is terminated with a terminating resistor arrangement with a variable reflection factor.

Abstract: A cylindrical magnetic resonance antenna suitable for use as a local antenna for the reception or transmission of magnetic resonance signals, has an antenna arrangement, such as a birdcage antenna arrangement with longitudinal conductors connected at their opposite ends by end rings. In each case, two adjacent longitudinal conductors and the end ring segments therebetween form a network. In each case, the end ring segments connecting two of the adjacent longitudinal conductors are formed as end ring sections, with an end ring capacitance connected therebetween, which is the same for all of the end ring segments. A grounded screen externally encompasses the antenna arrangement. The grounded screen is composed of electrically conductive material and is coupled through a screen capacitance to the longitudinal conductors and the end rings.

Abstract: A dividing wall made from at least one first wall material for delimitation of a patient positioning region from an antenna structure of a magnetic resonance tomography apparatus has at least one region at which a specific sub-structure of the antenna structure is located on the side of the dividing wall facing away from the patient positioning region, at which the dividing wall has a wall part made from a second wall material with a dielectric constant that is lower than the dielectric constant of the first wall material.

Abstract: An antenna unit for a PET/MRI scanner is disclosed, including a supporting tube in which at least one antenna for MR signals is arranged. In at least one embodiment, the supporting tube has at least one permeable section and one impermeable section, the permeable section of which has a greater permeability to PET quanta than the impermeable section. The antenna unit further includes a screen for radio-frequency signals which is arranged outside of the supporting tube and surrounds the latter. In at least one embodiment, an intermediate layer is arranged between the supporting tube and the screen and, in the region of the permeable section of the supporting tube, is composed of, at least in part, a material which has a permeability to PET quanta comparable to the permeable section.

Abstract: A birdcage resonator for magnetic resonance applications has two ferrules disposed in spaced-apart parallel ferrule planes. A line connecting the ferrule centers defines the antenna axis of the birdcage resonator, which orthogonally intersects the ferrule planes. The birdcage resonator has a number of antenna rods regularly distributed around the antenna axis, extending from ferrule to ferrule. The birdcage resonator has two coupling rings in addition to the ferrules that surround the antenna axis in respective coupling ring planes orthogonal to the antenna axis, and that are spaced from but coupling with the ferrules. The coupling rings are tuned to cause the ferrules to be resonant at frequencies other than without the coupling rings. The ferrules couple with one another in common eigenmodes, namely a common mode with a common mode frequency, and a push-pull mode with a push-pull frequency differing from the common mode frequency.

Abstract: A combined positron emission tomography/magnetic resonance imaging apparatus for imaging organs of an examination object in an examination space is disclosed, including a positron emission tomography apparatus having at least one radiation detector, and a magnetic resonance imaging apparatus having at least one gradient coil and a radio-frequency antenna device.

Abstract: In a method for controlling a magnetic resonance system with a number of individually controllable transmission channels, a limited number of antenna control parameter sets are available that are associated with respective different examination situation classes that are defined with regard to specific examination situation parameters. The antenna control parameter sets include, for each of the transmission channels, a channel value or a channel value combination with which a relative amplitude and a relative phase of a radio-frequency signal emitted via the appertaining transmission channel are defined. Respective current examination situation parameter values to be associated with the examination situation parameters for the magnetic resonance measurement to be implemented are then detected and one of the examination situation classes is selected based on this.

Abstract: In an arrangement to affix RF coils (in particular local coils) on a patient in examinations with a magnetic resonance apparatus, using a horizontal board to accommodate the patient for a magnetic resonance examination to be implemented; with the RF coil that has coil electronics; a fastening strap is fashioned to affix the coil on the patient and the fastening strap has an connection cable integrated therewith. The coil electronics are supplied with energy via the integrated connection cable.

Abstract: A sandwich structure which attenuates the PET radiation only very slightly, is used as a support tube for the transmit antenna. In at least one embodiment, it includes a thin strong inner wall, a likewise thin and strong outer wall and an interior of the support tube which is of the honeycomb type or is made of foam material.

Abstract: A magnetic resonance system has a basic magnet that generates a static basic magnetic field in an examination volume, and a whole-body antenna that emits a homogeneous radio-frequency field in the examination volume, the homogeneous radio-frequency field exhibiting an excitation frequency so that nuclei in an examination subject in the examination volume are excited to emit magnetic resonance signals, and a radio-frequency shield. The radio-frequency shield is arranged between the whole-body antenna and the basic magnet. The whole-body antenna is arranged between the radio-frequency shield and the examination volume. The radio-frequency shield is fashioned to exhibit a high shielding effect in a shielding frequency range that encompasses the excitation frequency. The shielding effect drops to a significantly lower shielding effect on both sides at side bands adjoining the shielding frequency range.

Abstract: A device to install and remove a structural component in and from a medical large device has a guide system that simplifies the difficult handling of the structural component due to the size or the weight of the structural component. The guide system has a first guide rail that can be positioned on a height-adjustable patient bed of the large device, and a guide groove which is arranged on the structural component. Additionally, another second guide rail can be attached to the medical large device, which forms an extension of the first guide rail when the patient bed is correspondingly positioned. With this device the structural component can be easily raised and lowered with the aid of the height-adjustable patient bed, and can easily be slid into and out of the large device when the first and second rails are at the same height.

Abstract: There is described a magnetic resonance device incorporating at least one first component part, which when the magnetic resonance device is operating oscillates, attached by at least one local load-bearing joint to at least one second oscillation-sensitive component part of the magnetic resonance device, where the joint has at least one actuatable facility for generating counter-oscillations which damp an oscillation of the first component part, where the second component part is a cladding element, in particular a vacuum cladding, which is affixed to the magnet via the joint, whereby a gap between the cladding element and the magnet is evacuatable, and the gap is provided with a pressure-isolating acoustically soft seal, in particular in the form of bellows.

Abstract: A device is disclosed for superposed magnetic resonance imaging and positron emission tomography imaging. The device includes a magnetic resonance imaging magnet which defines a longitudinal axis; a magnetic resonance imaging gradient coil arranged radially within the magnetic resonance imaging magnet; a magnetic resonance imaging RF coil arranged radially within the magnetic resonance imaging gradient coil; and a multiplicity of positron emission tomography detection units arranged in pairs opposite one another about the longitudinal axis. In at least one embodiment, the many positron emission tomography detection units are arranged radially within the magnetic resonance imaging gradient coil and can be inserted into the device and can be removed from the device along the longitudinal axis. In at least one embodiment, a carrier tube is provided having a multiplicity of pockets, which in each case extend along the longitudinal axis, for accommodating at least one positron emission tomography detection unit.

Abstract: An arrangement for radiation of a radio-frequency field into an examination subject has a local coil unit with a housing. An insulating dielectric material is embodied at least at one part of the housing in order to passively compensate an inhomogeneity of the B1 field that occurs in the examination subject. An adjustment arrangement allows for fixed but detachable provision of the insulating dielectric material at the housing part.

Abstract: A whole-body antenna for a magnetic resonance system has an antenna structure including at least one antenna rod extending in a longitudinal direction. The antenna rod can be charged with a transmission current to cause an excitation signal to be emitted that causes magnetic resonance signals to be excited in an examination subject arranged in an examination region. Microwave elements for emission of microwave signals into the examination region and/or for acquisition of microwave signals from the examination region are integrated into the first antenna rod on the side thereof facing toward the examination region. The microwave elements include antenna elements and circuit components associated with the antenna elements. The antenna elements are arranged on the side of the antenna rods facing toward the examination region. The circuit components are surrounded by the antenna rods both on the side thereof facing toward the examination region and on the side thereof facing away from the examination region.

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 device for superposed magnetic resonance tomography and positron emission tomography imaging is disclosed. In at least one embodiment, the device includes a magnetic resonance tomography magnet, which defines a longitudinal axis; a magnetic resonance tomography gradient coil, arranged radially within the magnetic resonance tomography magnet; a magnetic resonance tomography RF coil, arranged radially within the magnetic resonance tomography gradient coil; and a multiplicity of positron emission tomography detection units, arranged in pairs lying opposite to one another about the longitudinal axis. In at least one embodiment, the many positron emission tomography detection units are arranged radially within the magnetic resonance tomography gradient coil and are arranged along the longitudinal axis next to the magnetic resonance tomography RF coil.

Abstract: A magnetic resonance system for generation of magnetic resonance exposures of an examination subject in a patient positioning region has an antenna structure with a number of antenna elements arranged in the patient positioning region. Feed lines respectively supply the antenna elements with radio-frequency signals for emission of a radio-frequency field in the patient positioning region and/or to accept radio-frequency signals acquired by the antenna elements. The magnetic resonance system also has a radio-frequency shielding that shields an external region outside of the patient positioning region from radio-frequency signals radiated in the patient positioning region. This radio-frequency shielding has a number of feedthroughs through which the feed lines are respectively directed from the external region over a short distance to the antenna elements.