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Abstract #0920

Impact of RF-shimming on the uniformity and specific absorption rate of spin-echo imaging at 7 Tesla

Filiz Yetisir 1 , Bastien Guerin 2 , Benedikt A. Poser 3 , Lawrence L. Wald 2,4 , and Elfar Adalsteinsson 1,4

1 Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, United States, 2 Dept. of Radiology, Martinos Center for Biomedical Imaging, Charlestown, MA, United States, 3 Faculty of Psychology and Neuroscience, Maastricht University, Maastricht, Netherlands, 4 Harvard-MIT Division of Health Sciences Technology, Institute of Medical Engineering and Science, Cambridge, MA, United States

In this work, pTx RF-shimming large tip angle pulses were designed that dramatically improved the flip angle uniformity of slice selective spin echo images at 7 T. It was also demonstrated that the pulse design algorithm is capable of reducing local SAR by 48% and 55% for excitation and refocusing pulses respectively at constant flip angle error.

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