Abstract #3253

Shortening nonlinear phase multiband refocusing pulses with VERSE

Naoharu Kobayashi¹, Kamil Ugurbil¹, and Xiaoping Wu¹

¹CMRR, Radiology, University of Minnesota, Minneapolis, MN, United States

Current high resolution, whole brain diffusion MRI protocol at 7T for the Human Connectome Project uses linear phase multiband (MB) refocusing pulses that have duration longer than 10 ms. Recent studies show that shorter duration can be obtained by designing nonlinear phase MB refocusing pulses. In this study, we designed root-flipped MB and hyperbolic secant (HS1) based MB refocusing pulses and investigated how the variable rate selective excitation (VERSE) principle can be used to further reduce the pulse duration. Our results suggest that both root-flipped and HS1 based MB refocusing pulses can be shortened by VERSE.

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