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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