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Abstract #0697

Accurate Absolute Thermal Monitoring With RF Radiometry

El-Sharkawy A, Sotiriadis P, Bottomley P, Atalar E
Johns Hopkins University

The MRI scanner can be used as a radiometer to passively measure noise power emitted by the human body and obtain absolute thermal measurement. The accuracy of thermal measurements depends critically on the precision with which the receiver coils can be matched and tuned to eliminate variations in the receiver chain characteristics. Here we present a new impedance sensing system for RF radiometry that has an accuracy of 0.1Ω. The system allows for continuous impedance sensing, matching and calibration that achieve, in phantom studies, temperature detection with accuracy of 0.2&[deg]C. This offers the potential for real-time SAR monitoring