Patent ID: 8508227

Claim:
A method for position dependent change of magnetization in an object, according to a requirement, in a measurement performed in a magnetic resonance apparatus, the method comprising the steps of: a) applying a static and homogeneous basic field oriented along a z-direction; b) superposing non-linear supplementary magnetic fields, varying in space and over time, on the static and homogeneous basic field, wherein dependences over time of field strengths of the supplementary magnetic fields in a region of the object are calculated and/or measured in a position dependent manner; c) calculating radio-frequency pulses using the time and position dependences of the supplementary magnetic fields determined in step b); and d) irradiating the radio-frequency pulses calculated in step c) in conjunction with the supplementary magnetic fields of step b), wherein the supplementary magnetic fields have a z-component spatial gradient which is not constant during at least at one instant of the irradiation.