A comparative study of RF heating of deep brain stimulation devices in vertical vs. horizontal MRI systems.
A comparative study of RF heating of deep brain stimulation devices in vertical vs. horizontal MRI systems.
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DOI：
10.1371/journal.pone.0278187
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发表时间：
2022
期刊：
影响因子：
3.7
通讯作者：
Golestanirad, Laleh
中科院分区：
文献类型：
--
作者：
Vu, Jasmine;Bhusal, Bhumi;Nguyen, Bach T.;Sanpitak, Pia;Nowac, Elizabeth;Pilitsis, Julie;Rosenow, Joshua;Golestanirad, Laleh
大多数评估有源电子植入物存在时磁共振成像（MRI）诱导的组织射频（RF）致热的研究都是在水平、闭孔MRI系统中进行的。垂直、开孔MRI系统具有90°旋转磁体和根本不同的RF线圈几何结构，因此在体内产生显著不同的RF场分布。关于细长植入物（例如此类扫描仪中的脑深部电刺激（DBS）器械）的射频加热知之甚少。在此，我们进行了第一项大规模实验研究，调查1.2 T垂直场MRI扫描仪（Oasis，Fujifilm Healthcare）与1.5 T水平场MRI扫描仪（Aera，Siemens Healthineers）的射频致热是否存在显著差异。将一种商业DBS器械植入多材料拟人化体模中，该器械模拟了从在我们机构接受DBS手术的患者术后计算机断层扫描图像中提取的30个真实的患者衍生电极导线轨迹。在4分钟高SAR射频暴露期间测量DBS电极导线周围的射频产热。此外，我们使用各种内部结构的电极导线进行了电磁模拟，以检查这种对射频加热的影响。当控制RMS B1+时，与水平扫描仪相比，垂直扫描仪中DBS电极导线头端周围的温度升高显著较低（0.33 ± 0.24°C vs. 4.19 ± 2.29°C）。电磁模拟表明，与水平扫描仪相比，垂直扫描仪中电极导线尖端周围组织的最大0. 1g平均SAR降低了17倍。直形和螺旋形内部导丝电极导线的结果一致。与1.5 T水平扫描仪相比，1.2 T垂直扫描仪中DBS电极导线头端周围的辐射加热和功率沉积显著较低。不同的铅结构的模拟表明，结果可能会扩展到其他制造商的铅。
The majority of studies that assess magnetic resonance imaging (MRI) induced radiofrequency (RF) heating of the tissue when active electronic implants are present have been performed in horizontal, closed-bore MRI systems. Vertical, open-bore MRI systems have a 90° rotated magnet and a fundamentally different RF coil geometry, thus generating a substantially different RF field distribution inside the body. Little is known about the RF heating of elongated implants such as deep brain stimulation (DBS) devices in this class of scanners. Here, we conducted the first large-scale experimental study investigating whether RF heating was significantly different in a 1.2 T vertical field MRI scanner (Oasis, Fujifilm Healthcare) compared to a 1.5 T horizontal field MRI scanner (Aera, Siemens Healthineers). A commercial DBS device mimicking 30 realistic patient-derived lead trajectories extracted from postoperative computed tomography images of patients who underwent DBS surgery at our institution was implanted in a multi-material, anthropomorphic phantom. RF heating around the DBS lead was measured during four minutes of high-SAR RF exposure. Additionally, we performed electromagnetic simulations with leads of various internal structures to examine this effect on RF heating. When controlling for RMS B1+, the temperature increase around the DBS lead-tip was significantly lower in the vertical scanner compared to the horizontal scanner (0.33 ± 0.24°C vs. 4.19 ± 2.29°C). Electromagnetic simulations demonstrated up to a 17-fold reduction in the maximum of 0.1g-averaged SAR in the tissue surrounding the lead-tip in the vertical scanner compared to the horizontal scanner. Results were consistent across leads with straight and helical internal wires. Radiofrequency heating and power deposition around the DBS lead-tip were substantially lower in the 1.2 T vertical scanner compared to the 1.5 T horizontal scanner. Simulations with different lead structures suggest that the results may extend to leads from other manufacturers.
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影响因子：
3.9
作者：
Mattei, Eugenio;Triventi, Michele;Calcagnini, Giovanni;Censi, Federica;Kainz, Wolfgang;Mendoza, Gonzalo;Bassen, Howard I.;Bartolini, Pietro
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3.3
作者：
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5.7
作者：
Kazemivalipour, Ehsan;Keil, Boris;Golestanirad, Laleh
通讯作者：
Golestanirad, Laleh
影响因子：
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