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Abstract #2639

Evaluation of 50mm vs. 100mm Landmark Step Size for Pacemaker RF MRI Safety Evaluation

Lillian Boodaghians1, Xin Huang1, Xi Lin Chen1, and Shiloh Sison2

1MRI Safety/Hardware Development, St. Jude Medical, Sylmar, CA, United States, 2MRI Safety/Hardware Development, St. Jude Medical, Sunnyvale, CA, United States

Pacemakers undergo evaluation per ISO/TS 10974 to determine MRI safety. In a 64 MHz 1.5T RF coil, a quarter wavelength for RF radiation within blood is approximately 130mm, suggesting simulations performed with z-dimensional landmark step size of 100mm might not sufficiently capture RF effects on power deposition at lead electrodes and voltage levels at the generator, requiring a 50mm step size instead. Through simulations using validated transfer functions, human body models, and MRI RF coil models, it is shown that the difference in results between 50mm and 100mm simulations may be incorporated into model uncertainty and 100mm simulations are sufficient.

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