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Abstract #3959

Accurate assessment of 11.7 T head coil energy deposition using field-drift tolerant proton resonance frequency-based MR thermometry

Jacco A de Zwart1, Peter van Gelderen1, Joe A Murphy-Boesch2, Jeff H Duyn1, and Natalia Gudino2
1Advanced MRI section, LFMI/NINDS, National Institutes of Health, Bethesda, MD, United States, 2LFMI/NINDS, National Institutes of Health, Bethesda, MD, United States

Synopsis

Keywords: Safety, High-Field MRI

Motivation: RF transmit safety for high-field MRI.

Goal(s): Validation of RF heating simulations for a human head transmit/receive coil for 11.7 T using high-sensitivity field-drift tolerant MR thermometry.

Approach: Isopropanol was added to a polyvinylpyrrolidone head phantom to serve as an internal reference for MR thermometry. This phantom was used to compare the RF energy deposition by a 500 MHz head coil with FDTD simulations.

Results: Temperature precision better than 20 mK was achieved. Correspondence between temperature maps and SAR prediction from FDTD simulations demonstrated validity of the approach for high-field coil safety assessment.

Impact: A state-of-the-art method for high-field transmit coil performance assessment is presented: High-accuracy FDTD simulation of SAR deposition from a 500 MHz human head coil was validated using a robust MR thermometry method, based on an internally-referenced phantom material.

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Keywords