Abstract: A detection unit is disclosed for arrangement in the main magnet of an MR device, which has both an RF transceiver system and a PET detector. In at least one embodiment the RF transceiver system is divided into two parts and the two parts are arranged upstream and downstream of the PET detector in the longitudinal direction of the patient tunnel. The RF transceiver system and PET detector are applied to the same image volume. In at least one other embodiment, an MR device is equipped with the detection unit, and in at least one other embodiment, a method operates the detection unit.

Abstract: A cylindrical antenna arrangement in a magnetic resonance apparatus has two feed points to feed in two partial signals, the two feed points being arranged on a cross-section of the antenna arrangement. The cross-section has a center point. A first angle is formed by the connection of a first feed point with the center point relative to a horizontal axis of the cross-section while a second angle is formed by the connection of a second feed point with the center point relative to the horizontal axis of the cross-section. An apparatus for controlling such an antenna arrangement has a device for signal splitting with two outputs and an input. A radio-frequency magnetic resonance signal is connected at the input. This signal is divided by the device for signal splitting into two partial signals of equal amplitude that are respectively supplied to an associated output. Each output of the device for signal splitting is connected with precisely one associated feed point of the antenna arrangement.

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: 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: 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 has a basic field magnet system that annularly surrounds an examination volume, a gradient system arranged radially within the basic magnetic system, a radio-frequency shield arranged radially within the gradient system and a whole-body coil arranged radially within the radio-frequency shield. The gradient system is essentially circular, such that the gradient system defines a gradient system axis. With regard to a complete circumference around the gradient system axis, the whole-body coil has a first segment and a second segment complementary to the first segment. The first segment covers an angular range of more than 180° relative to the gradient system axis. The whole-body coil exhibits a constant curvature radius in the first segment and is more gently curved in the second segment than in the first segment.

Abstract: An RF antenna arrangement of a combined MR/PET system is disclosed. In at least one embodiment, the RF antenna arrangement includes a first part installed in the examination tunnel in a fashion fixed to the system such that it is arranged underneath the couch board when the latter is introduced, and a second part, which can be placed onto the couch board and be introduced into and withdrawn from the examination tunnel together with the couch board. In at least one embodiment, the second part is of dimensionally stable design and has a clear cross section that is adapted to the object to be examined. Consequently, the time outlay for applying the RF antenna is reduced, and the fixed position of the RF antenna enables a correction of the attenuation of gamma rays. Furthermore, a number of second parts having various diameters can be provided.

Abstract: Detection unit is disclosed for arrangement inside a cylindrical patient receptacle of a magnetic resonance apparatus. In at least one embodiment, the detection unit includes an annular PET detector arrangement with PET detector blocks, and a radiofrequency coil arrangement, arranged coaxially inside the PET detector arrangement and including longitudinal conductors, the longitudinal conductors being guided at least in sections along interspaces between mutually spaced apart detector blocks.

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: A magnetic resonance antenna has longitudinal antenna rods in a birdcage structure, and antenna ferrules connecting the longitudinal antenna rods at their ends in terms of radio-frequency. The magnetic resonance antenna has a number of radio-frequency switching elements that interrupt, in terms of radio-frequency, at least one part of the longitudinal antenna rod to detune the eigen-resonance frequency of the antenna with respect to an operating magnetic resonance frequency. For this purpose, the magnetic resonance antenna is provided with two switching lines, directed to the radio-frequency switching elements from outside of the birdcage structure, the switching lines having a ring line connected thereto running annularly on or in the birdcage structure and transverse to the longitudinal antenna rods.

Abstract: In a method and magnetic resonance examination apparatus wherein the field strength of radio-frequency pulses emitted by an antenna of the magnetic apparatus, the current flowing in the antenna upon the emission of the radio-frequency pulses is regulated by a predetermined nominal value by variation of a power fed into the antenna.

Abstract: A magnetic resonance antenna has longitudinal antenna rods in a birdcage structure, and antenna ferrules connecting the longitudinal antenna rods at their ends in terms of radio-frequency. The magnetic resonance antenna has a number of radio-frequency switching elements that interrupt, in terms of radio-frequency, at least one part of the longitudinal antenna rod to detune the eigen-resonance frequency of the antenna with respect to an operating magnetic resonance frequency. For this purpose, the magnetic resonance antenna is provided with two switching lines, directed to the radio-frequency switching elements from outside of the birdcage structure, the switching lines having a ring line connected thereto running annularly on or in the birdcage structure and transverse to the longitudinal antenna rods.

Abstract: A magnetic resonance tomography apparatus has a basic field magnet that is surrounded by a magnet envelope. This basic field magnet surrounds and limits an interior space with a gradient coil system disposed in this interior space and a body coil having an RF antenna and a carrying tube disposed in said gradient coil system as an inner encapsulation cylinder. The magnet envelope and the gradient coil system are both optically as well as acoustically closed by the body coil and a cladding at the end faces and in the interior. The body coil is manufactured by a vacuum casting or vacuum die-casting process.

Abstract: A radio-frequency antenna for a magnetic resonance system has a number of antenna rods and two end rings. The antenna rods are regularly arranged around an antenna axis and are connected at their respective rod ends to the end rings. When the antenna rods proceed essentially parallel to the antenna axis, they have a rod spacing in their middle region from the antenna axis that is smaller than a end ring spacing that at least one of the end rings exhibits from the antenna axis. When the antenna rods form an angle of inclination with the antenna axis, they have a rod spacing from the antenna axis at their end lying closer to the antenna axis that is smaller than an end ring spacing exhibited by the end ring that is connected to that rod end. In both version, rod spacing lies between 25 and 35 cm and is between 5 and 15 mm smaller than the end ring spacing.

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: In a method and magnetic resonance examination apparatus wherein the field strength of radio-frequency pulses emitted by an antenna of the magnetic apparatus, the current flowing in the antenna upon the emission of the radio-frequency pulses is regulated by a predetermined nominal value by variation of a power fed into the antenna.

Abstract: A magnetic resonance tomography apparatus has a basic field magnet that is surrounded by a magnet envelope. This basic field magnet surrounds and limits an interior space with a gradient coil system disposed in this interior space and a body coil having an RF antenna and a carrying tube disposed in said gradient coil system as an inner encapsulation cylinder. The magnet envelope and the gradient coil system are both optically as well as acoustically closed by the body coil and a cladding at the end faces and in the interior. The body coil is manufactured by a vacuum casting or vacuum die-casting process.

Abstract: A radio-frequency antenna for a magnetic resonance system has a number of antenna rods and two end rings. The antenna rods are regularly arranged around an antenna axis and are connected at their respective rod ends to the end rings. When the antenna rods proceed essentially parallel to the antenna axis, they have a rod spacing in their middle region from the antenna axis that is smaller than a end ring spacing that at least one of the end rings exhibits from the antenna axis. When the antenna rods form an angle of inclination with the antenna axis, they have a rod spacing from the antenna axis at their end lying closer to the antenna axis that is smaller than an end ring spacing exhibited by the end ring that is connected to that rod end. In both version, rod spacing lies between 25 and 35 cm and is between 5 and 15 mm smaller than the end ring spacing.

Abstract: A radio-frequency shield for a diagnostic magnetic resonance apparatus has a hollow-cylindrical carrier composed of a dielectric, a first electrically conductive coating arranged at an inside of the carrier and provided with axially aligned separating slots, and A second electrically conductive coating arranged at an outside of the carrier and provided with axially aligned separating slots. The separating slots in the first and second coatings, respectively, are offset relative to one another in a circumferential direction. The first coating has slotted end regions at the ends of the carrier and at least one slofted middle region between the end regions. The separating slots arranged in the end regions are transverse slots that are arranged at axially inwardly disposed ends of the separating slots.

Abstract: An antenna for a magnetic resonance device comprises an antenna conductor structure and capacitors connected thereto. The antenna conductor structure and/or the capacitors are connected to a water cooling system.