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目的通过磁共振三维时间飞跃法(3D-TOF),探讨颅内动脉成窗变异磁共振血管造影(MRA)的发生率、好发部位及其临床意义。方法收集行颅颈部磁共振3D-TOF检查的患者资料1445例,将原始图像经工作站处理,得到最大密度投影(MIP)和容积重组(VR)图像,分析颅内动脉成窗变异的影像学特点。结果 1445例病例中,发现颅内动脉成窗变异38例(检出率2.63%,38/1445),其中位于基底动脉16例(检出率1.11%,16/1445);大脑前动脉12例(检出率0.83%,12/1445);椎动脉6例(检出率0.42%,6/1445);大脑后动脉3例(检出率0.21%,3/1445);大脑中动脉1例(检出率0.07%,1/14451)。38例成窗变异病例中有1例合并动脉瘤。结论磁共振3D-TOF能清楚显示和诊断颅内动脉成窗变异这一少见血管异常。
Objective To investigate the incidence, occurrence and clinical significance of intracranial arterial window-opening magnetic resonance angiography (MRA) by 3D magnetic resonance time-of-flight method (3D-TOF). Methods 1445 cases of craniocervical magnetic resonance (MR) 3D-TOF were collected. The original images were processed by workstation to obtain maximum density projection (MIP) and volumetric reconstruction (VR) images. Features. Results Among the 1445 cases, intracranial arteries were found in 38 cases (detection rate: 2.63%, 38/1445), including 16 cases of basilar artery (detection rate 1.11%, 16/1445), 12 cases of anterior cerebral artery (Detection rate 0.83%, 12/1445); 6 vertebral arteries (detection rate 0.42%, 6/1445); 3 posterior cerebral arteries (detection rate 0.21%, 3/1445); 1 middle cerebral artery (Detection rate 0.07%, 1 / 14,451). One of the 38 cases of window-variant cases had aneurysm. Conclusion Magnetic resonance 3D-TOF can clearly show and diagnose intracranial arterial window mutation which is a rare vascular abnormality.