3T、5T 与 7T 容积内插式飞行时间磁共振血管成像在显示远端小脑血管中的比较。
Time-of-Flight Intracranial MRA at 3 T versus 5 T versus 7 T: Visualization of Distal Small Cerebral Arteries.
机构信息
From the Departments of Radiology (Z.S., S.Z., X.M., X.Y., C.C., S.R., J.L., M.Z.) and Neurology (H.W.), Zhongshan Hospital, Fudan University, No. 180 Fenglin Rd, Xuhui District, Shanghai 200032, China; Shanghai Institute of Medical Imaging, Shanghai, China (Z.S., S.Z., Y.Z., X.Y., C.C., S.R., J.L., M.Z.); Institute of Science and Technology for Brain-Inspired Intelligence, Fudan University, Shanghai, China (X.Z., B.W., B.Z., H.W.); Central Research Institute, United Imaging Healthcare, Shanghai, China (Y.Z., Y.D.); Shanghai United Imaging Healthcare, Shanghai, China (S.H.).
出版信息
Radiology. 2023 Jan;306(1):207-217. doi: 10.1148/radiol.220114. Epub 2022 Aug 30.
Background Three-dimensional (3D) time-of-flight (TOF) MR angiography (MRA) at 7 T has been reported to have high image quality for visualizing small perforating vessels. However, B inhomogeneity and more physiologic considerations limit its applications. Angiography at 5 T may provide another choice for intracranial vascular imaging. Purpose To evaluate the image quality and cerebrovascular visualization of 5-T 3D TOF MRA for visualizing intracranial small branch arteries. Materials and Methods Participants (healthy volunteers or participants with a history of ischemic stroke undergoing intracranial CT angiography or MRA for identifying steno-occlusive disease) were prospectively included from September 2021 to November 2021. Each participant underwent 3-T, 5-T, and 7-T 3D TOF MRA with use of customized MR protocols within 48 hours. Radiologist scoring from 0 (invisible) to 3 (excellent) and quantitative assessment were obtained to evaluate the image quality. The Friedman test was used for comparison of characteristics derived from 3 T, 5 T, and 7 T. Results A total of 12 participants (mean age ± SD, 38 years ± 9; nine men) were included. Visualizations of the distal arteries and small vessels at 5-T TOF MRA were significantly higher than those at 3 T (median score: 3.0 vs 2.0, all < .001 for distal segments and lenticulostriate artery; median score: 2.0 vs 0, < .001 for pontine artery). The total length of small vessel branches detected at 5 T was larger than that at 3 T (5.1 m ± 0.7 vs 1.9 m ± 0.4; < .001). However, there was no evidence of a significant difference compared with 7 T in either the depiction of distal segments and small vessel branches (average median score, 2.5; all > .05) or the quantitative measurements (total length, 5.6 m ± 0.5; = .41). Conclusion Three-dimensional time-of-flight MR angiography at 5 T presented the capability to provide superior visualization of distal large arteries and small vessel branches (in terms of subjective and quantitative assessment) to 3 T and had image quality similar to 7 T. © RSNA, 2022
背景 7T 下的三维（3D）时间飞跃（TOF）磁共振血管成像（MRA）已被报道具有较高的可视化小穿支血管的图像质量。然而，B 不均匀性和更多的生理因素限制了其应用。5T 下的血管造影可能为颅内血管成像提供另一种选择。目的 评估 5T 3D TOF MRA 用于可视化颅内小分支动脉的图像质量和脑血管可视化效果。材料与方法 参与者（健康志愿者或因疑似狭窄闭塞性疾病而行颅内 CT 血管造影或 MRA 检查的缺血性脑卒中患者）于 2021 年 9 月至 11 月前瞻性纳入。每位参与者在 48 小时内分别使用定制的 MR 方案行 3T、5T 和 7T 3D TOF MRA。采用 0（不可见）至 3（极好）的放射科评分和定量评估来评估图像质量。采用 Friedman 检验比较 3T、5T 和 7T 得出的特征。结果 共纳入 12 名参与者（平均年龄±标准差，38 岁±9；9 名男性）。5T TOF MRA 对远端动脉和小血管的显示明显高于 3T（远端节段和纹状体动脉的中位数评分：3.0 比 2.0，均<.001；脑桥动脉的中位数评分：2.0 比 0，<.001）。5T 检测到的小血管分支总长度大于 3T（5.1m±0.7 比 1.9m±0.4；<.001）。然而，与 7T 相比，远端节段和小血管分支的显示（平均中位数评分，2.5；均>.05）或定量测量（总长度，5.6m±0.5；=.41）均无明显差异。结论 5T 3D TOF MRA 能够在主观和定量评估方面提供优于 3T 的远端大动脉和小血管分支可视化效果，且图像质量与 7T 相似。 ©RSNA，2022
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