Department of Radiology, Kurume University School of Medicine, Asahi-machi, 67, Kurume-shi, Fukuoka, 830-0011, Japan.
Department of Neurosurgery, Kurume University School of Medicine, Asahi-machi, 67, Kurume-shi, Fukuoka, 830-0011, Japan.
Jpn J Radiol. 2020 Sep;38(9):853-859. doi: 10.1007/s11604-020-00981-x. Epub 2020 May 6.
Some of the detachable microcoils are associated with the prominent metallic artifact. We have applied Silent MRA to reduce the artifact. In this study, we present a retrospective study in which Silent MRA is used for cases showing prominent metallic artifact on conventional TOF-MRA due to a detachable bare platinum microcoil (Barricade coil).
Fifteen patients, who had undergone endosaccular embolization using Barricade coil and other detachable microcoils up to 3 days previously, were scanned with TOF-MRA and silent MRA at the same time. The treatment DSA and follow-up MRA images were graded by two experienced neuroradiologists, focusing on the visibility of residual aneurysm and parent arterial lumen.
DSA images showed residual aneurysm (RA) in four, residual neck (RN) in six, and complete occlusion (CO) in five patients. TOF-MRA images showed RN in five, CO in four, mild defect (MD) in one, severe defect (SD) in three, and complete defect in two. In contrast, on Silent MRA, the grades were RA in two, RN in five, CO in five, and MD in three.
Barricade coils are associated with prominent metallic artifact on TOF-MRA. Silent MRA is useful for follow-up MRA after embolization using Barricade coils. The metallic artifacts were compared between TOF-MRA and Silent MRA in patients treated by using Barricade coils. Barricade coils are associated with more metallic artifact on TOF-MRA than Silent MRA. Silent MRA is useful for follow-up MRA after embolization using Barricade coils.
一些可分离的微线圈与明显的金属伪影有关。我们应用 Silent MRA 来减少伪影。在这项研究中，我们进行了一项回顾性研究，其中使用 Silent MRA 对由于可分离的裸铂微线圈（Barricade 线圈）导致常规 TOF-MRA 显示明显金属伪影的病例进行检查。
15 名患者在 3 天前接受了 Barricade 线圈和其他可分离微线圈的血管内囊内栓塞治疗，同时进行了 TOF-MRA 和 Silent MRA 扫描。两名有经验的神经放射科医生对治疗后的 DSA 和随访 MRA 图像进行了评分，重点关注残余动脉瘤和母动脉管腔的可见性。
DSA 图像显示 4 例残余动脉瘤（RA）、6 例残余瘤颈（RN）和 5 例完全闭塞（CO）。TOF-MRA 图像显示 5 例 RN、4 例 CO、1 例轻度缺陷（MD）、3 例重度缺陷（SD）和 2 例完全缺陷。相比之下，在 Silent MRA 上，分级为 2 例 RA、5 例 RN、5 例 CO 和 3 例 MD。
Barricade 线圈在 TOF-MRA 上会产生明显的金属伪影。Silent MRA 对使用 Barricade 线圈栓塞后的随访 MRA 很有用。在使用 Barricade 线圈治疗的患者中，比较了 TOF-MRA 和 Silent MRA 之间的金属伪影。与 Silent MRA 相比，TOF-MRA 上的 Barricade 线圈产生的金属伪影更多。Silent MRA 对使用 Barricade 线圈栓塞后的随访 MRA 很有用。
