Method for obtaining amplitude and phase dependencies of RF pulses for spatially selective excitation

A method comprising:

• obtaining an amplitude and phase behavior with time of radio frequency pulses, which are irradiated within a scope of a main magnetic resonance experiment for generating a predetermined n-dimensional spatial distribution of transverse magnetization within an object by means of at least one radio frequency transmitting antenna of a magnetic resonance measuring system in combination with spatially and temporally varying additional magnetic fields which are superimposed on a static and homogeneous basic field of the magnetic resonance measuring system and which change a transverse magnetization phase in the object in dependence on location and time, wherein n>=1, wherein the obtaining comprises:
• a) performing, using the magnetic resonance measuring system, a preparational measurement in which a change with time of the transverse magnetization phase in the object under the exclusive action of the additional magnetic fields is measured in a position-resolved fashion, wherein measuring the change with time of the transverse magnetization phase comprises sampling a magnetic resonance signal during a time period in which the radio frequency pulses are to be applied;
• b) calculating an amplitude and phase behavior with time of the radio frequency pulses for the main experiment using the measured change with time of the transverse magnetization phase of step a);
• and
• performing the main experiment using the magnetic resonance measuring system to transmit the radio frequency pulses calculated in step b).