Abstract #0543
Z-stacked RF array design enhances parallel transmit multiband RF performance in whole brain simultaneous multislice imaging at 7T
Xiaoping Wu 1 , Jinfeng Tian 1 , Sebastian Schmitter 1 , Tommy Vaughan 1 , Kamil Ugurbil 1 , and Pierre-Francois Van de Moortele 1
1
CMRR, Radiology, University of Minnesota,
Minneapolis, Minnesota, United States
Simultaneous MultiSlice (SMS) MR imaging using MultiBand
(MB) RF pulses is becoming increasingly popular in
neuroimaging. Recently, there has been an interest in
utilizing multielement RF arrays combined with
multichannel (pTx) MB pulse design to reduce transmit B1
inhomogeneity and SAR for SMS/MB imaging. Meanwhile, it
has been shown that the use of transmit coil elements
that approximately align with the slice direction, such
as Z-stacked arrays with azimuthally distributed
elements in two rings displaced from each other along
the Z-direction versus axial slices, can provide
improved RF performance for pTx non-MB pulses at 3T and
7T, as compared to conventional single ring arrays. In
this study, we evaluate the performance of such transmit
coil element/slice geometries for achieving whole brain
SMS/MB imaging at 7T by designing pTx MB RF pulses based
on electromagnetic simulations.
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