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Abstract #4076

RF Shim Flexibility with Multi-Surface-Loop Arrays Over Varying Head Geometries

Benjamin M Hardy1,2, Yurui Gao2,3, and Adam W Anderson2,3
1Department of Physics and Astronomy, Vanderbilt University, Nashville, TN, United States, 2Vanderbilt University Institute of Imaging Science, Nashville, TN, United States, 3Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, United States

Magnetic and electric field values are simulated with up to 480 Radio Frequency surface loops 1 cm in radius surrounding realistic head models. The work investigates the capability of B1+ shimming alone with increased degrees of freedom. Transmit efficiency, power limitations, and target homogeneity across the brain volume inform design choices for the array. Evidence of the effects of subject to subject variation can be seen in the optimized shim weights magnitude and phase variation for a choice 256-element geometry optimized over 20 unique head models oriented at 3 head angles.

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