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Abstract #0119

RF Power Deposition and Temperature Rise for Thermo-Acoustic Ultrasound Signal Generation from Lead Tips in MRI

Neerav Dixit1, John Pauly1, and Greig Scott1
1Electrical Engineering, Stanford University, Stanford, CA, United States

Using the pressure signals resulting from RF energy absorption, thermo-acoustic ultrasound (TAUS) enables detection of excessive local SAR at the lead tips of implanted devices, which causes RF-induced lead tip heating in MRI. Interleaving TAUS acquisitions with MR sequences may also allow for real-time lead tip temperature tracking during MRI. However, generating TAUS signals requires some RF energy deposition and heating at lead tips. Here, we analyze the amount of RF power at lead tips and the associated lead tip temperature rise needed to generate the TAUS signal.

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