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 Oshinski^4,5, 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

Synopsis

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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