Abstract #0349

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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