Electromagnetic Modeling of the Implantable Electrode for Transfer Function Calibration in MRI RF-Induced Heating Assessment

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Journal of Electromagnetics RF and Microwaves in Medicine and Biology Pub Date : 2024-06-20 DOI:10.1109/JERM.2024.3414830
Tiangang Long;Changqing Jiang;Luming Li
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Abstract

Radiofrequency-induced heating represents a significant and intricate challenge during the combined use of magnetic resonance imaging and active implantable medical devices. The coupling of the transfer function (TF) determination process and radiofrequency (RF) exposure experiment is a perennial problem in the field. In this study, the tip electrode was separated from the lead and numerically modeled for analysis. The current induced at the electrode in the TF measurement scenario was estimated by analyzing the electromagnetic (EM) fields near the electrode. The magnitude of TF was calibrated according to the estimated current source. The tip response under RF exposure is independently predicted with an error of less than 10% using the obtained scaled TF in simulation studies. Near-electrode EM fields analysis introduces a novel perspective in RF-induced heating evaluation study.
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用于核磁共振成像射频感应加热评估中传递函数校准的植入式电极电磁建模
在磁共振成像和有源植入式医疗设备的联合使用过程中,射频引起的加热是一个重大而复杂的挑战。传递函数(TF)确定过程与射频(RF)暴露实验的耦合是该领域长期存在的问题。在本研究中,尖端电极与导线分离,并进行了数值建模分析。通过分析电极附近的电磁(EM)场,估算了在 TF 测量情况下电极上的感应电流。根据估计的电流源校准 TF 的大小。在模拟研究中使用获得的缩放 TF 独立预测射频暴露下的针尖响应,误差小于 10%。近电极电磁场分析为射频诱导加热评估研究引入了一个新的视角。
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CiteScore
5.80
自引率
9.40%
发文量
58
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Front Cover Table of Contents IEEE Journal of Electromagnetics, RF, and Microwaves in Medicine and Biology About this Journal IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology Publication Information Front Cover
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