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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