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Abstract #4184

Safety Assessments in the Cascaded Media Using an Electro-optic Sensor-based Transfer Function Measurement Setup

Ali Caglar Özen1,2, Thomas Lottner1, Simon Reiss1, Andreas Bitzer3, 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, 3Institute of Photonics and ICT (IPI), University of Applied Sciences HTW Chur, Chur, Switzerland

MR safety evaluations of metallic implants/devices are performed in single homogeneous media. However, most of the implants/devices function in different media interfaces such as DBS and iEEG electrodes, catheters, biopsy needles…, etc. Loading of the conducting lines change drastically inside media with different dielectric properties, so does the RF-induced heating characteristics. To improve in vitro MR safety evaluations, we introduce a new TF measurement setup that allows safety evaluations in cascaded media (CM). The performance of the CM-TF setup was verified on isolated and bare lead wires immersed in air/tissue-simulating-medium interface by comparing to FDTD simulations and analytical models.

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