A Technique to Evaluate MRI-Induced Electric Fields at the Ends of Practical Implanted Lead
A Technique to Evaluate MRI-Induced Electric Fields at the Ends of Practical Implanted Lead
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DOI：
10.1109/tmtt.2014.2376523
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发表时间：
2015-01-01
影响因子：
4.3
通讯作者：
Chen, Ji
中科院分区：
文献类型：
--
作者：
Feng, Shi;Qiang, Rui;Chen, Ji
本文提出了一种新的技术，用于有效评估磁共振成像（MRI）在植入金属电极导线附近的感应电场或感应电压。该技术是基于互易定理结合惠更斯原理。该方法允许将微观尺度金属导线模拟/测量与MRI扫描仪内的宏观水平体模人体模拟解耦。因此，可以大大简化植入电极导线上的MRI感应加热和起搏器器械上的感应电压的估计。此外，该方法清楚地解释了MRI手术期间的感应电极导线发热机制。数值算例和实测结果表明了该方法的有效性和准确性。
This paper presents a novel technique for efficient evaluation of magnetic resonance imaging (MRI)-induced electric fields or induced voltages in the vicinity of implanted metallic leads. The technique is based on the reciprocity theorem in conjunction with the Huygens Principle. This approach allows one to decouple the micro-scale metallic lead simulation/measurement from the macro-level phantom human simulations within the MRI scanners. Consequently, the estimation of MRI-induced heating on an implanted lead, and the induced voltage on the pacemaker device can be greatly simplified. In addition, this method clearly explains the induced lead heating mechanism during MRI procedures. Several numerical examples, as well as measurement results are given to demonstrate the efficiency and accuracy of this method.