Radiofrequency heating of retained cardiac leads during magnetic resonance imaging at 1.5 T and 3 T.
Radiofrequency heating of retained cardiac leads during magnetic resonance imaging at 1.5 T and 3 T.
复制标题
在 1.5 T 和 3 T 磁共振成像期间对保留的心脏引线进行射频加热。
DOI：
10.1109/embc46164.2021.9629867
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Golestanirad,Laleh
中科院分区：
文献类型：
--
作者：
Nguyen,BachT;Bhusal,Bhumi;Fawcett,Kate;Golestanirad,Laleh
由于植入导线周围组织的射频 (RF) 加热存在风险，佩戴心血管植入式电子设备 (CIED) 的患者通常无法接受磁共振成像 (MRI)。尽管 MR 条件 CIED 可用，但此类设备的安全标签并不适用于具有碎片保留导线 (FRL) 的患者，在拔出原始设备后，导线的片段仍留在组织中。与 CIED 的完整且孤立的引线不同，FRL 通常是与组织直接接触的裸露导电引线碎片。迄今为止，还没有评估 MRI 期间 FRL 射频加热的实验工作报道。在这项工作中，我们进行了体模实验，测量 4 个患者衍生的 FRL 模型在基于凝胶的 ASTM 类体模中在 64 MHz（1.5 T 质子成像）和 123 MHz（3 T 质子成像）射频暴露期间的 RF 加热。我们发现 FRL 模型在 1.5 T 和 3 T 下进行 10 分钟扫描期间，凝胶中产生的温升可以忽略不计（ΔT<1.84 °C）。这些结果与之前的模拟研究一致，表明 MRI 可以安全地对保留导线碎片的患者进行。
Patients with cardiovascular implantable electronic devices (CIEDs) are often prevented from receiving magnetic resonance imaging (MRI) due to risks associated with radiofrequency (RF) heating of tissue around the implanted leads. Although MR-conditional CIEDs are available, the safety labeling of such devices does not extend to patients with fragmented retained leads (FRLs), where segments of the leads are left in the tissue after the original device is extracted. Unlike intact and isolated leads of CIEDs, FRLs are often bare conductive lead fragments in direct contact with the tissue. No experimental work has been reported that assess RF heating of FRL during MRI thus far. In this work, we performed phantom experiments to measure RF heating of 4 patient-derived FRL models in a gel-based ASTM-like phantom during RF exposure at 64 MHz (proton imaging at 1.5 T) and 123 MHz (proton imaging at 3 T). We found FRL models to generate negligible temperature rise in the gel (∆T<1.84 °C) during a 10-minute scan at both 1.5 T and 3 T. These results are in agreement with previous simulation studies and suggest MRI may be performed safely in patients with fragmented retained leads.