Abstract #1454
Local and global SAR constrained large tip angle 3D kt points parallel transmit pulse design at 7 T
Filiz Yetisir 1 , Bastien Guerin 2 , Lawrence L. Wald 2,3 , and Elfar Adalsteinsson 1,3
1
Dept. of Electrical Engineering and Computer
Science, Massachusetts Institute of Technology,
Cambridge, MA, United States,
2
Martinos
Center for Biomedical Imaging, Dept. of Radiology,
Massachusetts General Hospital, Charlestown, MA, United
States,
3
Harvard-MIT
Division of Health Sciences Technology, Cambridge, MA,
United States
Explicit SAR constraints have been proven useful for
slice selective small tip angle pulse design. We propose
a nonselective pulse design method that explicitly
constrains local SAR and RF peak amplitude at large tip
angle and demonstrate that when local SAR is controlled
directly rather than via control of peak RF voltage,
safer pulses with better excitation profiles are
obtained. Our method is more practical than Tikhonov
regularized strategies since it only requires one run to
ensure that all the limits (SAR and RF) are satisfied.
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