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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