Method for location-dependent alteration of the magnetisation in an object as part of a magnetic resonance experiment

摘要

The method involves applying a static and homogeneous basic field oriented along a z-direction. Non-linear supplementary magnetic fields varying in space and over time are superposed on the basic field. Dependences over time of field strengths of the magnetic fields in a region of an object are measured in a position dependent manner. Radio-frequency pulses are calculated and irradiated in conjunction with the magnetic fields, where the magnetic fields have a z-component spatial gradient, which is not constant during an instant of irradiation.