Thermo-Acoustic Ultrasound Detection of RF Tip Heating in MRI
Neerav Dixit1, Pascal Stang2, John Pauly1, and Greig Scott1
1Electrical Engineering, Stanford University, Stanford, CA, United States, 2Procyon Engineering, San Jose, CA, United States
Thermo-acoustic ultrasound uses pressure waves generated by
thermoelastic expansion to measure heating. This technique can be used to
detect excessive local SAR and RF tip heating in implanted or interventional devices.
We compare the signal quality and inherent properties of several modulation
schemes for thermo-acoustic ultrasound. We then interface a system for
thermo-acoustic detection of heating with an MRI scanner and demonstrate the
first use of thermo-acoustic ultrasound to detect RF tip heating from an MRI scanner.
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