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Abstract #2211

SAR/B1+ calibration workflow for safe, high duty-cycle parallel transmission imaging at ultra-high field

Filiz Yetisir1, Bastien Guerin2, Lawrence Wald2,3, and Elfar Adalsteinsson1,3

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

In this work, we propose a pTX safety workflow that will enable high duty cycle imaging at high field systems. Several SAR and B1+ calibration steps are suggested for a complete analysis including modeling the TX array, testing it over time and different loads and finding a safety margin to account for RF system imperfections. Good qualitative agreement was achieved between the simulated and measured B1+ maps for the TX array. 11% and 6° standard deviation was observed in the magnitude and the relative phase maps over time. A maximum difference of 16% was observed between offline and online calculated local SAR values due to RF system imperfections.

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