Faster Fat-Water Imaging with a Novel Multislice Time-Shifted GRASE-Dixon Sequence.

Kuan J. Lee¹, Jochen Leupold¹

A new multislice GRASE-Dixon imaging sequence is introduced which can double the rate at which slices are acquired for Dixon fat-water imaging. Current implementations have a minimum interval between consecutive refocusing pulses which determines the minimum acquisition time. Our sequence uses some of the time on one side of the spin-echo from one slice to fit in the refocusing pulse from another slice; thus, an extra slice is acquired in the same time. The excitation and refocusing pulses from one slice are time-shifted relative to those from the other slice, thereby maintaining CPMG conditions. In-vivo results at 1.5T are shown.