Department of Neurosurgery, Iwate Medical University School of Medicine, 1-1, Idaidori 2-chome, Yahaba-cho, Shiwa-gun, Iwate, 028-3694, Japan.
Division of Ultra-high Field MRI, Institute for Biomedical Sciences, Iwate Medical University School of Medicine, 1-1, Idaidori 2-chome, Yahaba-cho, Shiwa-gun, Iwate, 028-3694, Japan.
Neuroradiology. 2023 Dec;65(12):1809-1812. doi: 10.1007/s00234-023-03208-8. Epub 2023 Sep 13.
Flow diverters (FDs) are utilized for a wide range of aneurysms, but show safety issues such as adverse interactions with static magnetic fields (displacement force and torque) and radiofrequency-induced heating during magnetic resonance imaging (MRI). The present study aimed to assess these adverse interactions in a 7-tesla (7T) static magnetic field and radiofrequency-induced heating during a 7T MRI for two types of FD. Displacement force and magnetically induced torque were assessed using the deflection angle method and low friction surface method, respectively. To assess heating, each FD was set in a phantom filled with gelled-saline mixed with polyacrylic acid and underwent a 7T MRI using a three-dimensional fast spin echo method. Displacement force and magnetically induced torque in the 7T static magnetic field were undetectable, and radiofrequency-induced heating during 7T MRI remained ≤ 0.6 °C for both types of FD, suggesting that magnetic field interactions and heating on FDs during a 7T MRI are acceptable from a safety perspective.
血流导向装置（FD）可用于多种动脉瘤，但存在安全性问题，例如与静磁场（位移力和扭矩）的不良相互作用，以及在磁共振成像（MRI）期间的射频感应加热。本研究旨在评估两种类型的 FD 在 7 特斯拉（7T）静磁场和射频感应加热期间的这些不良相互作用。使用偏转角法和低摩擦面法分别评估了位移力和磁感应扭矩。为了评估加热，将每个 FD 设置在充满凝胶盐水的体模中，并用聚丙烯酸混合，并使用三维快速自旋回波方法进行 7T MRI。在 7T 静磁场中未检测到位移力和磁感应扭矩，两种类型的 FD 在 7T MRI 期间的射频感应加热仍保持≤0.6°C，这表明从安全性角度来看，在 7T MRI 期间 FD 上的磁场相互作用和加热是可以接受的。
