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Abstract #4069

MRI Implant Safety: Novel Mechanistic Model and Safety Assessment Approach for Small Implants and Abandoned Leads

Ilaria Liorni1, Esra Neufeld1, Sven Kuehn1, Manuel Murbach1, and Niels Kuster1,2

1IT'IS Foundation, Zuerich, Switzerland, 2ETHZ, Zuerich, Switzerland

Safety assessment of active implants is defined in the technical specification ISO/TS 10974. However, the safety of small passive implants must be assessed individually for each device, e.g., via the ASTM F2182-11a standard test method. Computational studies have demonstrated that the mechanism postulated for elongated implants at 64 MHz is not applicable. We propose a new mechanistic theory of general validity applicable across a large frequency range to describe exposure enhancement at critical lead locations. Simulation-based assessment was successfully compared to predictions from the mechanistic model on the impact of several parameters (tissue dielectric properties, insulation thickness, and tip shape).

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