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Abstract #0014

Acousto-optic Based Active MRI Marker for Interventional MRI Devices

Yusuf Samet Yaras1, Sarp Satir1, Cagla Ozsoy2, Rajiv Ramasawmy3, Adrienne E Campbell-Washburn3, Anthony Faranesh3, Robert Lederman3, Ozgur Kocaturk2, and Levent Degertekin1

1G.W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, United States, 2Institute of Biomedical Engineering, Bogazici University, Istanbul, Turkey, 3Division of Intramural Research, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD, United States

Conspicuous and safe MR markers are essential for tracking interventional MRI devices. The RF induced heating on long conductors used in current active MR markers presents a safety risk. In this work, a novel acousto-optic active MR marker with optical fiber connection is proposed to eliminate RF induced heating. The proposed marker consists of a miniature coil coupled to a piezoelectric transducer which in turn modulates the reflected light in the optical fiber. The linearity of the acousto-optic active marker with flip angle is characterized and initial in vitro imaging experiments are performed demonstrating marker visibility under MRI.

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