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Abstract #0311

Whole brain single shot diffusion weighted EPI at 7 Tesla using parallel transmit multislice multiband RF pulses

Xiaoping Wu 1 , An T. Vu 1 , Sebastian Schmitter 1 , Edward Auerbach 1 , Steen Moeller 1 , Christophe Lenglet 1 , Essa Yacoub 1 , Pierre-Francois Van de Moortele 1 , and Kamil Ugurbil 1

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

Simultaneous Multi-Slice (SMS) imaging using MultiBand (MB) RF pulses has shown great success in functional and diffusion weighted (DW) MRI studies of the brain. Recently, this technique has been combined with parallel transmission (pTx) and it has been demonstrated that pTx MB pulse design can significantly improve transmit B1 homogeneity at 7T and/or reduce RF power consumption relative to a single channel Circular Polarized mode application. Those results were obtained for a few slices in the brain using a gradient echo imaging sequence and did not tackle the problem of whole brain coverage or more challenging spin-echo based acquisitions. In the present study, advances towards volumetric coverage with pTx MB pulses is reported and results of whole brain single-shot, diffusion weighted echo planar imaging (DW-EPI) at 7T using pTx MB RF pulses are presented.

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