Modeling and measurement of lead tip heating in implanted wires with loops
Lydia J Bardwell Speltz, Seung-Kyun Lee, Yunhong Shu, Matt A Bernstein
TL;DR
This study examines how loops in implanted wires affect heating during MRI scans and compares theoretical models with experimental results to improve safety.
Contribution
The study extends existing models to predict lead tip heating in wires with loops and validates them experimentally.
Findings
Both models accurately predicted heating trends in various wire configurations.
The adapted transmission line model showed higher accuracy than the simple exponential model.
Loop configurations significantly influence heating depending on wire orientation relative to the RF electric field.
Abstract
Objective. In MRI, conductive lead tip heating caused by radiofrequency (RF) power deposition is an important safety issue for patients with implanted devices. In this work, we investigate lead tip heating in different wire configurations that contain loop(s) through theoretical models and experimental measurements. Approach. We have previously proposed analytical transfer function models to predict relative heating of implanted, straight metallic leads. Here we extend the models’ application to leads containing loops, that are widely used in the clinic. Maximum temperature rise caused by RF heating was measured at 1.5 T on twenty (20) insulated, capped wires with various loop and straight segment configurations. The experimental results were compared with predictions from the previously reported simple exponential and adapted transmission line models, as well as with a long-wavelength…
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Taxonomy
TopicsAdvanced MRI Techniques and Applications · Ultrasound and Hyperthermia Applications · Electronic Packaging and Soldering Technologies