Magnet coil arrangement for generating a homogeneous magnetic field for magnetic resonance arrangements

Claim 1

A magnet coil arrangement for generating a magnetic field which is homogeneous at least in its centre, preferably for magnetic resonance spectroscopy, consisting of four flat, pair-wise identical ring coils, coil planes of the ring coils extending perpendicularly to an axis of examination which extends through the coil centres and the coils being symmetrically arranged with respect to a central point on the axis of examination, the ring coils which belong to different pairs having different mean winding diameters as well as rectangular winding cross-sections, the sides of which extend perpendicularly and parallel, respectively, to the axis of examination, the coil pair having the large mean winding diameter being situated between the coils of the pair having the smaller mean winding diameter, current flowing in the same direction through all ring coils, characterized in that the mean winding diameter of the smaller ring coils (23) amounts to approximately 0.635 times the mean winding diameter (Y1) of the larger ring coils (22) and the axial winding width (b) of all ring coils amounts to approximately 0.084 times this diameter, the radial winding height (41) of the larger ring coils amounting to approximately 0.162 times the mean winding diameter of the larger ring coils, the radial winding height (42) of the smaller ring coils (23) amounting to approximately 0.100 times this diameter, the distance (Z1) between the central plane of the larger ring coils and the central point (P) amounting to approximately 0.144 times this diameter, and the distance (Z2) between the central plane of the smaller ring coils and the central point amounting to approximately 0.376 times this diameter, the number of ampere-turns of the larger ring coils being at least approximately 1.65 times the number of ampere-turns of the smaller ring coils.