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Abstract #4176

Safety of active catheters in MRI: Termination impedance versus RF‐induced heating

Ali Caglar Özen1,2, Thomas Lottner1, 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

To assess the MR safety of an active catheter, the interaction of an arbitrary E-field with an isolated transmission line was modeled analytically in cascaded lossy media. The catheter tip SAR was calculated for different E field configurations and termination impedances that were controlled by an input impedance unit integrated into the receiver interface circuit. Results of the analytical calculations were compared to transfer function (TF) measurements, and found to be in good agreement. By adjusting the input impedance, SAR at the tip of an active catheter could be reduced by 95%.

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