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Abstract #2008

Dual Mode Acousto-optic RF Safety Sensor for Electric Field and Temperature Measurement at 1.5T MRI

Yusuf Samet Yaras1, Lee W Bradley1, Dursun Korel Yildirim2, Ozgur Kocaturk3, John Oshinski4,5, and F. Levent Degertekin1
1Mechanical Engineering, Georgia Institute of Technology, ATLANTA, GA, United States, 2Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States, 3Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey, 4Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, United States, 5Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, United States


Electric field and temperature sensors are essential tools for RF safety assessment of implants during magnetic resonance imaging. In this work, an acousto-optic sensor was used for both local tangential electric field and temperature measurements. The inherent electric field sensitivity of the piezoelectric crystal mechanically coupled to a fiber Bragg grating provides the electric field information while the thermal sensitivity of FBG is used for temperature measurement for dual mode sensing. The sensor was used to measure the electric field concentration around a reference implant with high SNR as well as the temperature rise at the tip of the implant.

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