2000 Volume 56 Issue 2 Pages 283-289
We evaluated the relationship between phase loop and fat suppression using the spectrally selected inversion recovery pulse(Spec IR)technique.The sequence was the three-dimensional fast spoiled gradient echo(3Dfast SPGR).The Spec IR technique utilizes a fat-selective inversion recovery pulse in order to suppress fat.When encoding is performed for all slices(phase-slab loop)with one phase encoding , it is necessary to perform slice encoding in a centric. On the other hand, when encoding is performed for all phases(slab-phase loop)with one slice encoding, it is necessary to perform phase encodings in a centric.For the phase-slab loop, an inversion recovery pulse equal to the number of phase encodings is used.For the slab-phase loop , an inversion recovery pulse equal to the number of slices is used.Since relatively few inversion recovery pulses are used with the slab-phase loop, the signal remains at the fat edge.
