GRADIENT-GENERATION SYSTEM, NUCLEAR-SPIN TOMOGRAPH AND PROCESS FOR THE GENERATION OF IMAGES USING A NUCLEAR-SPIN TOMOGRAPH

摘要

The invention concerns a system for the generation of magnetic gradient fields which intermittently overlap the static magnetic field of a nuclear-spin tomograph. The system has at least one pair of gradient coils which are fed from a mains-powered device, through which current flows in series when in operation and which generate, in a given volume of material under examination, a gradient magnetic field which varies at least approximately in linear fashion with position in one direction. The system is characterized by the fact that each gradient coil (A, B) has a set of windings with at least a first winding zone (S1) and a set of windings with at least a second winding zone (S2) which have separate connections (16, 17; 18, 19), such that the winding zones can be easily connected to each other, and disconnected in a different way. This enables the user to alter the properties of the gradient system.