MRI Gradient Induced Device Heating of Active Implantable Medical Devices vs Gradient Magnetic Field (dB/dt rms)

As part of the MR safety assessment for AIMDs per ISO/TS 10974, an evaluation for gradient induced device heating must be performed. For this evaluation, the temperature response of the device is assumed to be proportional to the square of dB/dt rms. While this has been shown to be true for simple structures like a conductive disk, no testing has been presented showing that this relationship is still valid for more complex AIMDs structures. In this abstract we therefore provide testing, on a representative AIMD, confirming gradient induced device heating for AIMDs is proportional to the square of dB/dt rms.