DETERMINATION OF THE WAVEFORM OF RF-PULSES FOR SELECTIVE EXCITATION IN MRI

The invention relates to a magnetic resonance method involving the generation of high-frequency pulses and magnetic gradients (gx, gy, gz) for the selective excitation of an object to be examined. According to the invention, the magnetic resonance method is characterized in that a magnetic resonance signal s(t) according to the following signal equation is generated: s  ( t ) = ∫ V  m ( r r , T )  exp  [ t  /  T 2 ]  exp  [    t   ω s ]  exp  [ -    k r  ( T - t ) · r r ]    3  r wherein m(lr,t) stands for a desired transversal magnetization after the selective excitation, t stands for a time, {right arrow over (r)} stands for a position vector and T stands for a duration of a pulse, and whereby s(t) stands for a magnetic resonance signal, V stands for a volume that is to be examined, T2 stands for a transversal relaxation time, and ωs stands for a shift of the resonance frequency. The invention also relates to a nuclear spin tomograph for carrying out the magnetic resonance method.