CONSTRUCTION OF MULTIPLY BAND-SELECTIVE SELF-REFOCUSING PULSES FOR SIMULTANEOUS SPIN-ECHO MULTISLICE IMAGING OF FLUID-FLOW, USING PULSED-FIELD GRADIENTS

Multiply frequency-band-selective, self-refocusing, radiofrequency pul ses were constructed to allow simultaneous, multislice imaging by the use of phase encoding within each pulse. This approach has an inherent signal-to-noise ratio advantage over the corresponding time-multiplex ed, slice-by-slice experiment. Selective, refocusing, 180 degrees puls es for the multiple excitations were also developed, allowing the expe riments to be performed as a Hahn spin echo, Simultaneous, multislice experiments with pulsed-gradient dow encoding were performed and the d eveloping pipe flow from a perforated distributor plate was examined. (C) 1995 Academic Press, Inc.