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Abstract

A magnet system for nuclear magnetic resonance (NMR) imaging volume has two magnet coils (S1, S2) arranged on both sides of an investigational volume coaxially relative to a z axis running through the center of the investigational volume and assuming positions relative to the center of the investigational volume of z.sub.S1 and z.sub.S2 with average separations r.sub.S1 and r.sub.S2 from the z axis. During operation, currents flow through the coils in the same direction. The system is characterized by ferromagnetic rings (R11 and R21) provided for on each of the two magnet coils (S1, S2) arranged closer to the center of the investigational volume than the corresponding neighboring magnet coil (S1 or S2). The rings (R11, R21) are positioned and dimensioned in such a fashion that the magnetic field in the center of the investigational volume can be rendered homogeneous up to 8th order. The axial separation g.sub.S of both magnetic coils (S1, S2) assumes a value between 1/4 and 3/4, preferentially 1/2 of the sum r.sub.S1 and r.sub.S2 of the average separations of both magnetic coils (S1, S2) from the z axis and the axial separation g.sub.R of both rings (R11, R21) is slightly, e.g. up to 15%, smaller than the axial separation g.sub.S between both magnet coils (S1, S2). The rings (R11, R21) are at least partially integrated into the coils. The system is compact, highly homogeneous and enjoys low power consumption while exhibiting good transverse and axial access.

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