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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