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Abstract #4381

Maximized Local B1+ Using Optimized Dielectric Pad at 7 T: Numerical Optimization and Experimental Validation

Sukhoon Oh1, Wei Luo2, Bei Zhang1, Cem Murat Deniz, Michael T. Lanagan3, Graham C. Wiggins1, Christopher Michael Collins1

1Center for Biomedical Imaging, School of Medicine, New York University, New York, United States; 2Center for NMR Research, Radiology, College of Medicine, The Pennsylvania State University, Hershey, PA, United States; 3Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA, United States

Dielectric materials with high permittivity have been used to improve signal homogeneity in high field MR images and enhance SNR near the pad. Permittivity, geometry, dimension, and location of dielectric pad are variables to be optimized to maximize the effect of a dielectric pad. In this study, we report the permittivity optimization of dielectric pad to maximize the local B1+ in a phantom with electromagnetic field simulations at 7T and verification with flip angle mapping experiments at 7T when the dielectric pad is present with different permittivity values.

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