Time symmetric pulse to uniformly rotate magnetization vectors by an arbitrary angle in the presence of large B1 inhomogeneities and resonance offsets

摘要

A method for achieving plane rotations using symmetrical adiabatic and composite pulses provides that the pulses are generated to include a pair of symmetrically positioned discontinuous phase shifts of equal but opposite magnitude and, in the case of adiabatic pulses, a flip in the effective Be executed concomitantly with the discontinuous phase shifts. Methods of spectral editing utilize the symmetrical pulse form with the discontinuous phase shifts accomplished with predetermined delays between segments of a pulse.