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
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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