Siemens Aktiengesellschaft

Karl-Georg Heinzelmann

Horst Siebold

Walter Distler

Helmut Forster

Winfried Platz

Sigismund Klein

Gunther Ries

Jurgen Vetter

The magnetic apparatus of a nuclear spin tomography system contains several magnet coils which are surrounded by an approximately hollow-cylindrical shielding device of ferromagnetic material. At each end face, this shielding device has a disc-shaped plate with a central opening. Four beam-like shielding elements of identical design having triangular or trapezoidal cross section, arranged distributed in the circumferential direction regularly on a common cylinder surface, extend between these plates at the end faces. With this magnetic apparatus, field distortions caused in the useful volume by the four beam-like shielding elements are substantially reduced. Each shielding element is extended in the outer regions of its base area facing the magnet coils to form a leg part extending toward the adjacent element which is spaced therefrom, which, together with the adjoining side surface of the shielding element, forms a common extended outside surface and has a predetermined thickness in the direction of the normal relative to this outside surface.

Magnetic apparatus of a nuclear spin tomography system with an

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.

Device for cooling a magnet system

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. The support points of the adjustable magnet coils are longitudinally spaced from the center of gravity line of the respective magnet coil so that an additional tilting force is brought about.

Apparatus for adjustably mounting coils of a magnet system for nuclear

In an exemplary embodiment, the current supply of the x-ray tube proceeds via a slip ring arrangement with sliding contacts arranged between the rotating frame and the stationary apparatus part. The slip ring arrangement with the sliding contacts is provided between two coaxial rings of which one is connected with the rotating frame, and the other is stationary. The rings have axially projecting intermeshing ribs, and the central openings of the rings are designed for the purpose of insertion of the patient support.

Tomographic x-ray apparatus for the production of transverse layer images

A radiation measuring arrangement is present which comprises a radiation source producing a radiation beam penetrating the radiography subject, and also a radiation receiver which determines the radiation intensity behind the subject. The measuring arrangement is arranged on a support which can be displaced parallel to the plane of the layer on a rotating track. A motor for driving the rotating track is also coupled with a gear ring, rotatably mounted on the rotating track so that this ring is continually rotated, while the rotating track is driven from the motor via a step by step drive unit. A gear wheel (14) is driven by the ring and in turn drives a crank for effecting displacement of the support for the measuring arrangement and also drives a further crank for a weight equalizer member. The lever arms of the cranks may be adjusted by a common motor from a remote station.

Tomographic apparatus for producing transverse layer images of a

The illustrated embodiment shows a film feeder for feeding individual film sheets to automatic developers. The film feeder has a magazine for receiving a stack of the film sheets, an extraction device and a transport device for transferring the individual film sheets extracted from the magazine into the automatic developer. The transport device contains an apparatus for selectively rotating the film sheets by approximately 45.degree. about their surface normal, and may be utilized with automatic developers which normally receive large-format films sheets, to enable the use of such developers with sheets of substantially shorter length dimension (e.g. 100 mm).

Film feeder

A collimator for a ray diagnosing device for taking pictures produced by gamma rays or similar penetrating rays consists of a honeycomblike constructed body with many holes, the walls of which absorb the rays. The invention is particularly characterized in that the walls of the collimator are made of strips which extend parallel to each other in their longitudinal directions and are so folded transversely to their longitudinal extension that when two strips are placed next to each other one side of a strip makes a series of holes with the adjacent side of the following strip, the holes having a symmetry axis which coincides with the line separating the two strips.

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Neunkirchen, Germany

Karl-Georg Heinzelmann