Abstract: A switchable gradient coil system is composed of saddle coils that can be operated respectively as primary coils or auxiliary coils. The auxiliary coils for one gradient axis, which exhibit a reduced subtended angle compared to the primary coils, are arranged in the gaps between coils that are arranged diametrically opposite each other in a radial plane for the other gradient axis.

Abstract: A switchable longitudinal gradient coil with a cylindrical structure and windings that are symmetrically arranged around the Z-axis is composed of discrete windings or winding packets, or of continuous windings or continuous winding packets, which are provided with a separate supply line to an end face and which, outside of the coil, can be selectively connected to one another individually and/or in groups corresponding to the desired performance features.

Abstract: In a method for the operation of a magnetic resonance apparatus, eddy current fields that are caused by at least one magnetic gradient field are at least partially compensated by means of a compensation setting, and the compensation setting is adapted dependent on a position of a mid-point of a region of an examination subject to be imaged with respect to a mid-point of an imaging volume of the magnetic resonance apparatus.

Abstract: An electrical conductor arrangement has conductor meshes that are arranged in areas with limiting lines defined by a network structure, and into which control devices are connected for the control of currents within the conductor arrangement.

Abstract: A magnetic resonance tomography apparatus has a basic field magnet system and a gradient coil system. At least a part of a vacuum housing of an evacuatable space is thereby formed by at least a surface region of the basic field magnet system and by at least a surface region of the gradient coil system. Propagation of oscillations (vibrations) of the gradient coil system to the basic field magnet system via an intermediate layer between those surfaces of the gradient coil system and of the basic field magnet system that face each other is prevented by a vacuum in the evacuatable space. In economical and space-saving fashion, the vacuum housing of the evacuatable space is formed to a large part by systems that are already needed for the operation of the apparatus.

Abstract: A gradient coil system for a magnetic resonance tomography apparatus has two tesseral gradient coils arranged on a substantially cylindrical surface. A transverse gradient coil composed of a gradient coil pair projects beyond the cylindrical surface at one end in the transverse direction, with a space in the tesseral direction remaining between the individual coils of the gradient coil pair of the transverse gradient coil.

Abstract: An electrical conductor arrangement has conductor meshes that are arranged in areas with limiting lines defined by a network structure, and into which control devices are connected for the control of currents within the conductor arrangement.

Abstract: A magnetic resonance apparatus has a basic field magnet system for generating a basic magnetic field and a coil system with a coil arrangement, wherein a course of a current-carrying conductor of the coil arrangement for generating a predetermined target magnetic field is determined according to a method that allows for linear secondary conditions. A noise-causing mechanical oscillation of the coil system as a result of Lorentz forces that act on the current-carrying conductor in the basic magnetic field is thereby taken into consideration by one of the linear secondary conditions, and the course of the conductor is additionally determined by the method so that the noise-causing oscillation is diminished.

Abstract: A gradient coil arrangement for a nuclear magnetic resonance tomography apparatus contains windings arranged in a primary winding plane as well as further windings arranged in a secondary winding plane. The primary and the secondary winding planes are radially spaced from each other thereby have a radial spacing. At an end face of the gradient coil arrangement, the windings have a number of open (free) conductor ends, and connector elements connect conductor ends in the primary winding plane to conductor ends in the secondary winding plane and/or connect conductor ends within one of the winding planes to one another. The connector elements are switchably fashioned for forming gradient coil arrangements having different field qualities/performance features.

Abstract: In a method for operating a MR-tomography device, and MR-tomography device, the gradient coil system can be switched to different field qualities during a pulse sequence, so that an optimized field quality can be chosen during the individual measuring phases of a pulse sequence.

Abstract: A method or apparatus for the simulation of electrical stimulations in an examination subject which are generated by rapidly switched gradient fields of an MR device, and wherein aborting of the executed measuring sequence occurs given the crossing of a threshold value in an online monitoring, wherein the crossing of the threshold value is signaled prior to the execution of the measuring sequence in a look-ahead monitoring, at least one gradient signal G(t) is determined which is defined by the time characteristic of the gradient pulses, at least one first filtered gradient signal GF1(t) is formed by filtering the gradient signal G(t) with a first filtering function fF1(t) a stimulation signal Stim(t) is formed which describes the stimulation of the examination subject, from the first filtered gradient signal GF1(t), and the stimulation signal Stim(t) is compared to a definable stimulation threshold value Stimlim. If Stimlim is exceeded an indicator indicating that a stimulation has occurred is emitted.

Abstract: A patient support apparatus has a stationary lower part and a displaceable upper part carrying a patient. The upper part has a guide surface which is curved in sectional plane, and the lower part has a guide surface matched to this curve. Outlet nozzles for air are provided in the guide surface of the lower part so that an air gap and an air cushion are produced between the guide surface of the lower part and the upper part by means of an air flow. The upper part, with a patient thereon, can be displaced in a longitudinal direction, perpendicular to the sectional plane, by riding on the air cushion.

Abstract: In a nuclear magnetic resonance tomography apparatus with ring coils for producing the basic magnetic field, effective portions of gradient coils are arranged on two radially spaced surfaces that lie symmetrical to the longitudinal axis of an examination chamber. The surfaces have in radial section, a curvature such that the distance between the two surfaces is greater in the center than at the edges.