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Abstract #3234

Direct SAR Mapping by Thermoacoustic Imaging: Experimental Proof-of-Concept

Simone Angela Winkler 1 , Paul Picot 2 , Michael Thornton 2 , and Brian K Rutt 1

1 Dept. of Radiology, Stanford University, Stanford, CA, United States, 2 Endra Inc., Ann Arbor, Michigan, United States

We propose a new concept for direct measurement of specific absorption ratio (SAR), to be used as a safety assessment / monitoring tool for MRI. The concept uses short bursts of RF energy and measures the resulting thermoacoustic excitation pattern by an ultrasound transducer array, followed by image reconstruction to yield the 3D SAR distribution. We conducted an experimental study to test the feasibility of this novel concept for direct SAR mapping. The promising results encourage us to further develop the method for application to in-vivo local SAR mapping.

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