Abstract #4898
Direct SAR Mapping by Thermoacoustic Imaging: A Feasibility Study
Simone Angela Winkler 1 , Paul Picot 2 , Michael Thornton 2 , and Brian K Rutt 1
1
Dept of Radiology, Stanford University,
Stanford, California, 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 developed a simulation
framework to model this thermoacoustic SAR mapping
concept; results of these simulations show good
agreement between reconstructed and original SAR
distributions and support the feasibility of direct
experimental mapping of SAR distributions in vivo.
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