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Abstract #3105

SAR Reduction in RF Shimming through the use of High Permittivity Materials: approach towards the Ultimate Intrinsic SAR

Gillian G Haemer 1,2 , Manushka V Vaidya 1,2 , Christopher M Collins 1,2 , Daniel K Sodickson 1,2 , Graham C Wiggins 1 , and Riccardo Lattanzi 1,2

1 The Center for Advanced Imaging Innovation and Research, and the Center for Biomedical Imaging, Department of Radiology, New York University School of Medicine, New York, NY, United States, 2 The Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States

Appropriate high-permittivity, low-conductivity materials (HPM) 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 Greens 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 transmit arrays with an increasing number of elements and Ultimate Intrinsic SAR as a reference. We generated L-curves showing ultimate performance could be approached with a relatively small number of transmit elements by optimizing the relative permittivity of the HPM layer.

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