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Abstract #2709

Evaluation of ISO/IEC JWG Tier 3 Approach for RF Heating in 1.5 MRI with Implantable Cardiac Rhythm Devices

Yan Liu1, Kevin Feng, Ji Chen, Xiaoyi Min2, Shiloh Sison2, Gabriel Mouchawar2, Jon Dietrich2

1University of Houston, Houston, TX, United States; 2St. Jude Medical

The ISO/IEC Joint Working Group developed tiers to establish the worst case RF heating for active implantable devices. Tier 3 utilizes the maximum simulated tangential electric field (Etan) along lead paths. Tier 3 was evaluated in five human body models by comparing Etan and maximum of rms tangential electrical fields over lead paths (Erms). Tier 3 can overestimate the effective E by more than a factor of 2 (factor of 4 in heating). Knowing tier 1 and tier 2 are more stringent than tier 3 indicates that the ISO/IEC JWG tiers 1-3 are over conservative for implantable cardiac rhythm devices.