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Abstract #1849

Increased labeling efficiency with Maxmin pTx B1+ shimming for pseudo-continuous Arterial Spin Labeling at 7T

Kai Wang1, Samantha J Ma2, Xingfeng Shao1, and Danny JJ Wang1
1University of Southern California, Los Angeles, CA, United States, 2Siemens Medical Solutions USA, Inc, Los Angeles, CA, United States

The transmit magnetic field (B1+) drop and B0 field inhomogeneity at the labeling plane make it challenging to achieve high labeling efficiency at ultrahigh field for pseudo-continuous Arterial Spin Labeling (pCASL). In this study, we designed the pCASL sequence with “Maxmin” shimming for the labeling and “MinCV” shimming for the acquisition utilizing the parallel transmission (pTx). Phantom and in-vivo experiments suggest MinCV shimming can improve the profile homogeneity within ROI and that Maxmin-shimmed labeling is a promising approach to increase the labeling efficiency for pCASL.

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