【摘要】 目的 探讨3D TOF MRA分段采集技术在脑血管性病变诊断中的应用价值。方法 收集在本院行磁共振3D TOF MRA分段采集技术的脑血管性疾病100例,使用GE 1.5T HD xt磁共振机,扫描参数:FOV 20 cm,层厚1.2 mm,扫描范围3～4块,每块32层,重叠部分8 mm,TR:minmum,TE:out of phase,反转角20°,图像参数选择主要包括磁转换(magnetization transfer,MT)。图像后处理使用GE 4.4工作站进行血管三维重组。结果 100例患者中,发现颅内动脉瘤26例,脑动静脉畸形、动脉瘤术后复查、烟雾病各5例,脑血管狭窄21例,38例脑血管未见异常。部分病例与其他影像学对比研究,诊断符合率为100%。3D TOF MRA可以立体、直观地显示脑血管的空间解剖细节,可充分观察到脑动脉瘤的准确起源、瘤体大小、颈部宽窄及血管走向等情况,本组病例中所显示的最小动脉瘤直径约2.6 mm,最大直径为28.9 mm;同时,3D TOF MRA也可作为脑动脉瘤术后评价的一种无创性检查方法,观察术后电解可脱弹簧圈所在的位置和远端血管通畅情况等。三维图像对于脑动静脉畸形和烟雾病有良好显示效果。三维成像中,容积再现图像最佳。结论 分段采集3D TOF MRA技术是在普通MRA基础上的改进,图像质量及诊断率较高,是一种无创性脑血管成像方法,在脑血管性疾病的诊断和术前术后评价中发挥着重要作用。更多还原

【Abstract】 Objective To evaluate the value of 3D TOF MR A with partition data gathering technique in the diagnosis of cerebral vascular diseases.Materials and Methods 100 patients with cerebral vascular diseases were examined with 3D TOF MRA(GE 1.5T HDxt;FOV:20 cm,slice thickness:1.2 mm,3-4 sections,32 slices each section,overlop locs:8 mm,TR:minmum,TE:out of phase,flip angle:20 degrees,magnetization transfer).Data were processed using GE ADW4.4 workstation.Results Of the 100patients,intracranial aneurysms were found in 26,arteriovenous malformation in 5,Moyamoya disease in 5 and cerebral vascular stenosis in 21,and 5 were for post-operative aneurysm review and 38 were normal.Images were compared with those aquired with other imaging modalities.The diagnosis coincidence rate was 100%.3D TOF MRA could clearly display spacial anatomic details such as the origin,size,,neck width,and route of cerebral aneurysm.The smallest diameter was 2.6 mm,and the largest 28.9mm.3D TOF MRA could also perform post-operative evaluations of cerebral aneurysm as an non-invasive examination method,being able to observe the locatin of electrolytically detachable coils and the patency of distal vessels.Besides,3D TOF MRA could be used to diagnose arteriovenous malformation,cavernous hemangioma and Moyamoya disease.Volume rendering(VR) was the best in the three-dimensional images.Conclusion As a non-invasive examination,3D TOF MRA can play an important role in the diagnosis and pre-and post-operative evaluation of cerebral vascular diseases.更多还原