Abstract #1359
Flip Angle Inhomogeneity Constrained pTx Pulse Design for Minimum Peak Local SAR
Mihir Pendse 1 , Simone Winkler 2 , and Brian Rutt 2
1
Department of Electrical Engineering,
Stanford University, Stanford, CA, United States,
2
Department
of Radiology, Stanford University, CA, United States
This work introduces a new minimum SAR spokes-based pTx
pulse design algorithm using a spokes trajectory that
achieves a desired flip angle inhomogeneity (FAI)
threshold while minimizing peak local SAR. Several
realistic scan situations are modeled including the use
of slightly inaccurate E-field maps for SAR matrix
computation to represent patient/body model mismatch and
enforcing a constraint on computation time for the
optimization. Simulated L-curves show that for four
different cases our proposed method achieves equal or
lower SAR at low values of FAI compared to prior
approaches for SAR-constrained pTx pulse design.
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