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Abstract #4075

MRI RF Safety of Active Implantable Medical Devices (AIMDs): Effect of Conductivity of Tissue Simulating Media on Device Model Accuracy

Krishna K.N. Kurpad1, Jingshen Liu2, Paul J Stadnik1, Jeffrey Von Arx1, Larry Stotts1, Wolfgang Kainz3, and Ji Chen2

1Micro Systems Engineering Inc., Lake Oswego, OR, United States, 2Department of ECE, University of Houston, Houston, TX, United States, 3US Food and Drug Administration, Silver Spring, MD, United States

The Tier 3 procedure for testing electrically long active implantable medical devices (AIMDs) for MRI RF safety involves the development of transfer function models (TFMs) of the AIMDs. Accuracy of the TFM depends on how closely the TSM mimics the tissues in which the AIMD is implanted. We find that the conductivity of the medium surrounding the lead electrode has a strong influence on the transfer function magnitude of the DUT. Therefore, TFMs of the DUT developed in a TSM whose conductivity mimics that of the in-vivo tissue that surrounds the electrode under test results in the most accurate TFM.

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