Abstract: A frame structure for supporting individual magnetic coils forming a magnet system used in nuclear spin tomography comprises several frame parts made from a ferromagnetic material to provide relatively simple magnetic shielding. The individual magnetic coils are concentrically aligned one behind the other along a common axis to form the magnet system. Several elongate beam, rod, or plate-shaped magnetic shielding elements extend parallel to the common axis and are evenly distributed in the circumferential direction around the magnet system thus forming a generally cylindrical surface. End-plate magnetic shielding parts having a central opening of predetermined radius are provided at the end faces of the cylindrical surface formed by the shielding elements to create a cage-like frame structure. Coil receiving elements can be used to rigidly connect the axis-parallel shielding elements with the individual magnetic coils.

Abstract: The gradient coil system for a nuclear spin tomography installation encloses a hollow cylindrical support body, the cylinder axis of which extends in the z direction of an orthogonal x-y-z coordinate system with the coordinate origin in the imaging center, in which direction also the magnetic field B.sub.z of a base generating a field gradient G.sub.z, at field magnet is oriented. The gradient coil system contains for least two ring-shaped individual coils which are arranged symmetrically to the x-y plane extending through the imaging center, and furthermore, pairs of saddle-shaped individual coils arranged symmetrically to this plane, for generating field gradients G.sub.x and G.sub.y. In this gradient coil system, the sound level caused in the hollow cylindrical support body is reduced by rigidly connecting the prefabricated G.sub.x and G.sub.

Abstract: A device for cooling a magnet system, especially in an installation for nuclear spin tomography which magnet system comprises several annular magnet coil windings which are made of ribbons of normal conducting material and are connected at their end faces over a large area to cooling elements in a heat conducting manner, the cooling elements cooled by a cooling medium flowing in coolant lines under forced flow. To assure an effective and reliable cooling of the coil windings on each end face of a magnet coil winding, a predetermined number of identically designed cooling elements uniformly distributed in the circumferential direction is cemented on, each cooling element comprising at least a heat conduction plate of annular sector shape which is provided with a predetermined number of slots uniformly distributed in the circumferential direction and to which the coolant line is connected over several turns in a heat conducting manner.

Abstract: The magnetic device of a nuclear spin tomography system contains several magnet coils which surround an interior suitable for accommodating a body to be examined, and generate therein an at least largely homogeneous magnetic field. The device also includes an approximately cylindrical shielding device which surrounds the coils and consists of ferromagnetic material, and has at each end face thereof, a washer-shaped part with a central opening with a predetermined radius with respect to the cylindrical axis, in order to make possible good lateral access to the magnet coils and to provide sufficient space for laterally protruding parts. At least four beam-like shielding elements of identical design are used to form the approximately cylindrical part of the shielding device, the elements being uniformly distributed in the circumferential direction over the cylindrical surface. The shielding elements may have rectangular or triangular cross-sectional shapes.

Abstract: An adjusting and holding assembly for magnet coils in a nuclear spin tomography system includes mechanical adjusting devices connected to a frame structure for the mutual alignment of the connected to a frame structure for the mutual alignment of the base field magnet coils. In order to enable a relatively simple adjustment of the individual magnet coils to produce a highly homogeneous base field, at least one of the magnet coils is rigidly connected to the frame structure, while each adjustable or positionable magnet coil is held at three points via at least one support device and three adjusting devices within the frame structure. Each support device comprises a support element in the form of a spherical sector rotatably mounted to a respective coil and slidably resting on a horizontal support surface of the frame structure.

Abstract: A disclosed exemplary method provides complete mensuration of all two-dimensional Fourier components of a nuclear spin property and image reconstruction. In spite of unavoidable inhomogeneities of the DC magnetic field, an optimum sectional image is to be obtained. To this end, the exemplary method provides an optimally brief pulse train in that first, by means of a 90.degree.-Hf-pulse with a switched-on z-gradient a z=constant layer is excited, after termination of which an x-gradient and simultaneously a y-gradient are switched on. Following this is a 180.degree.-Hf-pulse which is followed by a z- and simultaneously a y-gradient, so that the difference between the y-gradient effect before the 180.degree.-Hf-pulse and thereafter can be varied. Then follows that particular x-gradient during which the nuclear spin echo is measured (whose symmetry center arises at a fixed time). For a N.times.N-image (N=number of the image points e.g.

Abstract: A gradient coil system for an image-generating, nuclear magnetic resonance tomographic apparatus, particularly a zeugmatographic apparatus. The gradient coil system is arranged on a hollow cylindrical support body having an axis which extends along the z-direction of an x, y, z coordinate system which has an origin in the center of an imaging region. The gradient coil system contains, in addition to ring-shaped individual coils for generating field gradients which are substantially constant in the imaging region, a plurality of saddle-shaped coils which are symmetrically arranged through the imaging center for generating field gradients in the x and y directions. The saddle-shaped coils have straight conductor sections extending in the z-direction and arc-shaped conductor sections which extend perpendicularly with respect to the z-axis and along the circumferential direction of the support body.

Abstract: A gradient coil system for an image-generating, nuclear magnetic resonance tomographic apparatus, particularly a zeugmatographic apparatus. The gradient coil system is arranged on a support body of rotational symmetry, illustratively a hollow cylindrical support body, having an axis which extends along the z-direction of an x, y, z coordinate system which has an origin in the center of an imaging region. The gradient coil system contains two pairs of toroidal individual coils which are arranged symmetrically with respect to an x-y plane which extends through the center of the imaging region and which are arranged perpendicular to the z-axis. The direction of current flow in the individual coils of a coil pair is opposite to the direction of flow in the individual coils of the other coil pair. Moreover, further sets of coils are provided for generating field gradient G.sub.x in the x-direction, and G.sub.y in the y-direction.

Abstract: A magnet system for generating a high-frequency field in an image-generating apparatus of the type which utilizes nuclear magnetic resonance technology, such as zeugmatography. The magnet system contains a pair of magnet coils which are arranged on an imaginary cylindrical surface and which generate a substantially homogeneous high-frequency field which is oriented radially with respect to an axis of the imaginary cylinder. A relatively large signal-to-noise ratio is achieved by utilizing frequencies of, for example, 20 MHz. The magnet system is further provided with at least a second pair of magnet coils which is arranged on at least one imaginary cylindrical surface, and rotated in the circumferential direction. The second pair of magnet coils receives a high-frequency current which is shifted in phase by a predetermined phase angle with respect to the current flowing through the first coil pair; the currents having substantially equal amplitudes.