Measuring RF-Induced Currents Inside Implants: Impact of Device Configuration on MRI Safety of Cardiac Pacemaker Leads
Measuring RF-Induced Currents Inside Implants: Impact of Device Configuration on MRI Safety of Cardiac Pacemaker Leads
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DOI：
10.1002/mrm.21881
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发表时间：
2009-03-01
影响因子：
3.3
通讯作者：
Bauer, Wolfgang R.
中科院分区：
文献类型：
--
作者：
Nordbeck, Peter;Weiss, Ingo;Bauer, Wolfgang R.
心脏起搏器电极导线的射频（RF）相关发热是磁共振成像（MRI）中的一个严重问题。最近的研究表明，这种加热强烈依赖于植入物在周围介质中的位置，但目前对这个问题的了解很少。在本研究中，对起搏器电极导线内的射频感应电流进行体模测量，以研究器械位置和电极导线配置对电极导线头端MRI相关发热量的影响。对720个器械位置/电极导线路径配置进行了研究。结果表明，某些配置与MRI诱导产热的风险高度增加相关，而各种配置未显示任何显著产热。可以根据起搏器电极导线内测量的电流强度值精确推断植入物发热。相对于周围介质的器械位置和电极导线配置对MRI中的射频致热量至关重要。这表明，由于其在体内的特定配置，相当数量的植入器械可能不会在MRI中偶然产生严重发热。然而，配置的微小变化可能会大大增加这种加热效应的风险，这意味着在MRI期间可能会出现危险情况。Magn Reson Med 61：570-578，2009. (C)2009 Wiley-Liss，Inc.
Radiofrequency (RF)-related heating of cardiac pacemaker leads is a serious concern in magnetic resonance imaging (MRI). Recent investigations suggest such heating to be strongly dependent on an implant's position within the surrounding medium, but this issue is currently poorly understood. In this study, phantom measurements of the RF-induced electric currents inside a pacemaker lead were performed to investigate the impact of the device position and lead configuration on the amount of MRI-related heating at the lead tip. Seven hundred twenty device position/lead path configurations were investigated. The results show that certain configurations are associated with a highly increased risk to develop MRI-induced heating, whereas various configurations do not show any significant heating. It was possible to precisely infer implant heating on the basis of current intensity values measured inside a pacemaker lead. Device position and lead configuration relative to the surrounding medium are crucial to the amount of RF-induced heating in MRI. This indicates that a considerable number of implanted devices may incidentally not develop severe heating in MRI because of their specific configuration in the body. Small variations in configuration can, however, strongly increase the risk for such heating effects, meaning that hazardous situations might appear during MRI. Magn Reson Med 61: 570-578, 2009. (C) 2009 Wiley-Liss, Inc.