A magnetic resonance method for using radio frequency pulses for spatially
selective and frequency selective or multidimensionally spatially
selective excitation of an ensemble of nuclear spins with an initial
distribution of magnetization in a main magnetic field aligned along a
z-axis, wherein a spin magnetization with a given target distribution of
magnetization is generated, and for refocusing the spin magnetization, is
characterized in that the radio frequency pulse is used as a sequence of
sub-pulses of independent duration, courses of gradients and spatial
and/or spectral resolution, comprising one or more large angle RF pulses
with tip angles greater than or approximately equal to 15.degree., which
generate a gross distribution of magnetization approximating the target
distribution of magnetization or a desired modification of the
distribution of magnetization with a mean deviation less than or
approximately equal to 15.degree., wherein the actual effect of the LAPs
on the distribution of spin magnetization before the radio frequency
pulse is used is calculated by integration of the Bloch equations without
small angle approximation, and one or more small angle RF pulses=SAPs
with tip angles less than or approximately equal to 15.degree. reducing
the difference between the target distribution of magnetization and the
gross distribution of magnetization caused by the LAPs.