Optimal Combination of Phase Cycling and Gradient Spoiling in DENSE Displacement Mapping
Wen H, Bennett E, Lorenz C, Spottiswoode B
National Institutes of Health
In DENSE and HARP displacement imaging the signal is a mixture of several k-space echoes and it is desirable to separate them or suppress the unwanted ones. These echoes acquire different phase factors from displacement encoding gradient and from phase shifts of the RF pulses in the encoding step, so they can be separated with phase-cycling of the RF pulses, and can be selectively suppressed with encoding gradient. The former costs more scan time and the latter causes signal reduction in the presence of strain. The optimal combination of the two is identified in the heart in this abstract.