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
Electrical Engineering and Computer Science,
Massachusetts Institute of Technology, Cambridge, MA,
of Radiology, Martinos Center for Biomedical Imaging,
Charlestown, MA, United States,
of Psychology and Neuroscience, Maastricht University,
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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