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Abstract #3956

Effects of Implantable Pulse Generator (IPG) Impedance on the MRI Conditionality of Active Implantable Medical Devices (AIMDs) under 1.5T MRI

Farshad Ebrahimi1, Jianfeng Zheng1, Qingyan Wang1, Hongbae Jeong2, Ananda Kumar2, and Ji Chen1
1Dept of Electrical and Computer Engineering, University of Houston, Houston, TX, United States, 2Division of Biomedical Physics, US Food and Drug Administration, Silver Spring, MD, United States

Synopsis

Keywords: Safety, Modelling, AIMD

Motivation: To understand the interchangeability the IPGs for an AIMD system under MR RF exposure.

Goal(s): To evaluate/compare the effect of AIMD input impedance on both the RF-induced heating and the RF-induced voltage under RF exposure.

Approach: Evaluate the AIMD models for both RF-induced heating/voltage using an implantable lead connected to IPGs with different input impedances. The AIMD models (transfer functions) are evaluated via the reciprocity approach.

Results: When the lead characteristic impedance and IPG impedance differ greatly, the device heating stays consistent. However, the induced voltage changes. Both RF-induced heating/voltage are crucial for the interchangeability of IPGs for an AIMD system.

Impact: This study emphasizes the significance of on the RF-induced voltage at the IPG in addition to heating at the distal end. The analysis method presented could serve as a valuable approach for assessing the interchangeability of IPGs for AIMDs.

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Keywords