Thermo-Acoustic Ultrasound for Detection of RF-Induced Device Lead Heating in MRI.
Thermo-Acoustic Ultrasound for Detection of RF-Induced Device Lead Heating in MRI.
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DOI：
10.1109/tmi.2017.2764425
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发表时间：
2018-03
影响因子：
10.6
通讯作者：
Scott GC
中科院分区：
文献类型：
--
作者：
Dixit N;Stang PP;Pauly JM;Scott GC
由于电极导线尖端附近存在射频感应加热的危险，植入了长导线医疗器械的患者通常无法接受MRI扫描。体模研究表明，这种加热在个案基础上有很大差异，表明许多植入器械的患者可以接受临床有用的MRI扫描而不会受到伤害。然而，在扫描前预测射频感应电极导线头端发热的困难阻止了许多植入物接受者接受扫描。在此，我们证明热声超声（TAUS）有可能用于预扫描程序，以评估MRI中射频诱导电极导线头端发热的风险。研制了一套TAUS信号检测系统，采用四种不同的TAUS采集方法。然后，我们将该系统与MRI扫描仪集成，并在从扫描仪的体线圈传输时，在模型电极导线尖端附近检测到RF功率吸收峰值。我们还开发并实验验证了模拟，以表征电极导线尖端附近产生的热声信号。这些结果表明，TAUS是评估RF植入物安全性的一种有前景的方法，随着进一步的发展，TAUS预扫描可以让更多的患者获得具有重要临床价值的MRI扫描。
Patients who have implanted medical devices with long conductive leads are often restricted from receiving MRI scans due to the danger of RF-induced heating near the lead tips. Phantom studies have shown that this heating varies significantly on a case-by-case basis, indicating that many patients with implanted devices can receive clinically useful MRI scans without harm. However, the difficulty of predicting RF-induced lead tip heating prior to scanning prevents numerous implant recipients from being scanned. Here, we demonstrate that thermo-acoustic ultrasound (TAUS) has the potential to be utilized for a prescan procedure assessing the risk of RF-induced lead tip heating in MRI. A system was developed to detect TAUS signals by four different TAUS acquisition methods. We then integrated this system with an MRI scanner and detected a peak in RF power absorption near the tip of a model lead when transmitting from the scanner’s body coil. We also developed and experimentally validated simulations to characterize the thermo-acoustic signal generated near lead tips. These results indicate that TAUS is a promising method for assessing RF implant safety, and with further development, a TAUS pre-scan could allow many more patients to have access to MRI scans of significant clinical value.