Ensuring Safety of Implanted Devices Under MRI Using Reversed RF Polarization
Ensuring Safety of Implanted Devices Under MRI Using Reversed RF Polarization
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DOI：
10.1002/mrm.22468
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发表时间：
2010-09-01
影响因子：
3.3
通讯作者：
Scott, Greig C.
中科院分区：
文献类型：
--
作者：
Overall, William R.;Pauly, John M.;Scott, Greig C.
由于射频（RF）加热的风险，目前阻止植入长导丝医疗植入物的患者接受磁共振成像（MRI）扫描。我们已经开发了一种简单的技术，用于确定这些植入物的加热电位，使用反向射频（RF）极化。该技术可以在患者之间使用，作为标准预扫描程序的一部分，以确保受试者的设备不会造成发热风险。通过使用反向正交极化，MR扫描可以仅对设备中的潜在危险电流敏感。在这里，我们得出的物理原理支配的技术，并探讨不准确的主要来源。通过有限差分模拟和植入电极导线的体模扫描验证了这些原理。这些研究证明了该技术在可能造成任何伤害之前灵敏地检测潜在危险的耦合条件的潜力。Magn Reson Med 64：823-833，2010. (C)2010 Wiley-Liss，Inc.
Patients with long-wire medical implants are currently prevented from undergoing magnetic resonance imaging (MRI) scans due to the risk of radio frequency (RF) heating. We have developed a simple technique for determining the heating potential for these implants using reversed radio frequency (RF) polarization. This technique could be used on a patient-to-patient basis as a part of the standard prescan procedure to ensure that the subject's device does not pose a heating risk. By using reversed quadrature polarization, the MR scan can be sensitized exclusively to the potentially dangerous currents in the device. Here, we derive the physical principles governing the technique and explore the primary sources of inaccuracy. These principles are verified through finite-difference simulations and through phantom scans of implant leads. These studies demonstrate the potential of the technique for sensitively detecting potentially dangerous coupling conditions before they can do any harm. Magn Reson Med 64:823-833, 2010. (C) 2010 Wiley-Liss, Inc.