Abstract #3541

Optimizing high permittivity materials for SAR minimization in transmit arrays: influence of the phase distribution of the excitation profile

Gillian G Haemer^1,2,3, Manushka V Vaidya^1,2,3, Daniel K Sodickson^1,2,3, Graham C Wiggins^1,2, and Riccardo Lattanzi^1,2,3

¹The Center for Advanced Imaging Innovation and Research (CAI2R), Department of Radiology, New York University School of Medicine, New York, NY, United States, ²The Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY, United States, ³The Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States

Appropriate high-permittivity, low-conductivity materials placed between the RF coil and the sample can provide performance improvement in both transmission and reception. We employed a simulation framework based on dyadic Green’s functions for multi-layered spherical geometries to analyze how HPMs affect the tradeoff between excitation homogeneity and global Specific Absorption Rate (SAR) for RF shimming at 7T using an L-curves analysis. Three target excitation profiles were analyzed, with uniform amplitude and varied phase, to determine the influence that target phase distribution has on the optimal relative permittivity results.

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