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Abstract #4199

RF Heating of a 64-Channel Implantable Electrode Grid: Simulation and Temperature Measurements

Thomas Lottner1, Simon Reiss1, Lukas Vincent Haas1, Johannes Erhardt2, Ali Caglar Özen1,3, Lars Bielak1, Martin Schüttler4, and Michael Bock1
1Dept. of Radiology, Medical Physics, Medical Center – University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, 2Department of Microsystems Engineering—IMTEK, University of Freiburg, Freiburg, Germany, 3German Consortium for Translational Cancer Research Partner Site Freiburg, German Cancer Research Center (DKFZ), Heidelberg, Germany, 4CorTec GmbH, Freiburg, Germany

Active implantable medical devices (AIMD) can restore body function in patients with neurological or other disorders which increases their quality of life considerably. In this work we measure RF-induced heating by MRI thermometry in combination with FOTP measurements and simulations and apply it to a 64-channel electrode grid. The combination of MR thermometry with high spatial resolution, FOTPs with high thermal resolution and supplementary simulations of electromagnetic and thermal processes shows how limitations of the individual methods are overcome and result in a more comprehensive understanding of the thermal dynamics resulting from the exposure of implants to RF-fields.

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