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Abstract #0792

MR Safety Watchdog for Safe Active Catheters: Wireless Impedance Controller with Real-time Feedback

Ali Caglar Özen1,2, Berk Silemek3,4, Thomas Lottner1, Ergin Atalar3,5, and Michael Bock1

1Department of Radiology, Medical Physics, Medical Center ‐ University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, 2German Cancer Consortium Partner Site Freiburg, German Cancer Research Center (DKFZ), Heidelberg, Germany, 3National Magnetic Resonance Research Center (UMRAM), Bilkent University, Ankara, Turkey, 4Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany, 5Department of Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey

RF-induced heating of implants or devices can be controlled through manipulation of their termination impedance which is dependent on the dielectric properties of the medium and the incident field configurations. We designed a wireless module that modifies the input impedance of an active catheter to keep the temperature increase below a threshold, ΔTmax. The wireless module monitors local heating at the tip of the catheter or can receive data from an external temperature measurement device to search for the optimal impedance that minimizes temperature rise. RF transmission is blocked via a feedback system when ΔTmax is exceeded.

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