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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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