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Abstract

An NMR tomography magnet system (1) comprises a cryostat having a horizontal room temperature bore (2) with a diameter d between 20 cm and 40 cm having a vessel (3) filled with liquid helium. In intimate thermal contact with the liquid helium is a superconducting solenoid coil (4) with a horizontal axis (100; z=0) for the production of a static homogeneous magnetic field B in a homogeneity volume (5) within the room temperature bore (2). The center of the homogeneity volume is located at a separation l.sub.m from an axial end (z=0) of the room temperature bore (2) and the outer skin (6) of the cryostat exhibits, at the depth l.sub.m from an axial end of the room temperature bore (2) and at least in an angular region about the horizontal cryostat axis (100), minimum separations h.sub.e, h from the inside of the room temperature bore (2) whereby l.sub.m, h.sub.e <35 cm, preferentially<30 cm, and h<50 cm. In this fashion, an investigational apparatus for partial body applications, in particular, for the investigation of human extremities is made available which can be manufactured with compact construction in an economical fashion. The apparatus facilitates high imaging resolution with low stray fields and, in particular, allows for investigations of patients with the patients assuming a comfortable body position.

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