目的 观测大脑前动脉的起源、走行及分支分布规律，期为脑血管疾病的诊疗提供影像学依据。 方法 随机收集100例无血管疾病的脑部多层螺旋CTA影像资料，利用其自带工作站进行图像后处理，观察大脑前动脉的影像解剖学结构。 结果 （1）测得大脑前动脉各段的数值，大脑前动脉A1段长度、内径及A1-A2夹角左右侧有统计学差异；（2）大脑前动脉走形变异率20%（20/100），其中左侧A1段优势征9%，右侧A1段优势征5%，左侧A1段缺如1%，双侧大脑前动脉发育不良1%，左侧A4、A5段代偿供血1%，右侧A1段优势征合并同侧A2~A5段狭窄（由左侧A2~A5段代偿供血）1%，A4、A5共干1%，双侧A1段畸形1%；（3）大脑前动脉单干型71%，双干型29%。 结论 多层螺旋CTA能清晰立体地显示大脑前动脉的全长和主要分支及其解剖变异；大脑前动脉的变异复杂，左右差异显著，可为临床病变的早期诊断和治疗提供可靠依据。
Objective To observe the origin、travel、and branch distribution of the anterior cerebral artery, which provides imaging basis for the diagnosis and treatment of cerebrovascular related diseases. Methods Brain Multilayer spiral CTA (MSCTA) imaging data of 100 patients without vascular disease were collected randomly, and the imaging anatomical structure of anterior cerebral artery was observed by using their own workstation for image post processing. Results (1) The values of each segment of the anterior cerebral artery were measured. There were statistical differences in length, inner diameter of segment A1 of the anterior cerebral artery, and the angle between A1 and A2 on the left and right sides. (2) The travel variation rate of the anterior cerebral artery was 20%, in which the dominant sign of the left A1 segment was 9 %, while the right A1 segment was 5 %. The absence rate of A1 segment on the left side was 1 %, the dysplasia rate of bilateral anterior cerebral artery was 1 %, and the A4-A5 segment on the left side of compensatory blood supply was 1 %. The dominant sign of right A1 segment combined with ipsilateral A2-A5 segment stenosis (compensated blood supply by the left A2-A5 segment) was 1 %. 1 % of A4 segment and A5 segment joint stenosis, 1% of bilateral A1 segment malformation. (3) There were 71 % of the anterior cerebral artery with single trunk type, and 29 % with double trunk type. Conclusions MSCTA can display the full length and main branches of anterior cerebral artery and its anatomical variations in a clear and three-dimensional manner. The variation of anterior cerebral artery is complex and the difference between left and right sides is significant, which can provide a reliable basis for early detection and interventional treatment of clinical lesions.
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