(SPGR) The SPGR pulse sequence is similar to the spoiled GRASS sequence. The spoiled gradient recalled (SPGR)
acquisition in steady state uses semi-random changes in
the phase of the radio frequency (RF) pulses to produce a spatially independent phase shift.
A collection of slices in a multislice acquisition with the same orientation. Multi-stack acquisitions are possible when the stacks parameter is greater than one.