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A counterpoise design for RF-induced heating reduction.

Yu Wang, Jianfeng Zheng, Qingyan Wang

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|October 6, 2020

Summary

This study introduces a new lead design for active implantable medical devices (AIMD) to reduce MRI radio-frequency (RF) heating. A counterpoise electrode diverts RF energy, decreasing specific absorption rate (SAR) by threefold.

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Area of Science:

Biomedical Engineering
Medical Imaging Physics
Implantable Device Technology

Background:

Active implantable medical devices (AIMD) pose risks during Magnetic Resonance Imaging (MRI) due to radio-frequency (RF) induced heating.
Minimizing RF-induced heating is crucial for patient safety during MRI scans of patients with AIMDs.

Purpose of the Study:

To present a novel lead body design for AIMDs that effectively reduces RF-induced heating during MRI.
To demonstrate the efficacy of a counterpoise electrode in mitigating RF energy absorption in AIMD leads.

Main Methods:

Numerical simulations were performed on three lead configurations with varying designs.
The proposed design incorporates a counterpoise electrode to decoy RF-induced energy.
Simulations were conducted at a 1.5 Tesla (T) MRI field strength.

Main Results:

The novel lead design significantly reduced RF-induced heating.
A reduction factor of 3 in peak 1g average Specific Absorption Rate (SAR) was achieved.
Optimal performance was dependent on the proper design and length of the counterpoise electrode.

Conclusions:

The novel lead body design with a counterpoise electrode is effective in reducing RF-induced heating in AIMDs during MRI.
This design offers a promising solution for enhancing the safety of patients with AIMDs undergoing MRI.
Further optimization of the counterpoise electrode length is key to maximizing heating reduction.