目的 探讨运用三维时间飞跃法（3D-TOF）磁共振血管成像显示大脑动脉环，为构建大脑基底动脉环三维可视化动脉图谱提供形态学资料。方法 对10例尸体的大脑动脉环进行动脉间角度及距离的测量。同时，对30例正常人的头颅进行3DTOF磁共振血管成像检查，图像经西门子Syngo B17工作站后处理，从影像学分析大脑动脉环。 结果 大脑前动脉显示率为100 %，均表现为双支型。动脉环内的均值距离为（1.06±0.23）cm,其与颈内动脉间的均值夹角为（63.13±9.72）°，与前交通动脉的均值夹角为（107.95±57.70）°；颈内动脉环内段显示率为100 %，其与大脑前动脉的均值夹角为（63.13±9.72）°，与后交通动脉的均值夹角为（123.20±10.37）°；大脑后动脉显示率为100%，动脉环内的均值距离为（0.56±0.12）cm，其与后交通动脉的均值夹角为（70.00±8.87）°，与基底动脉的均值夹角为（123.95±11.43）°；后交通动脉显示率为100%，动脉环内的均值距离（1.06±0.17）cm，其与颈内动脉的均值夹角为（123.20±10.37）°，与大脑后动脉的均值夹角为（70.00±8.87）°，与大脑中动脉的均值夹角为（131.15±15.21）°；前交通动脉的显示率为80%，动脉环内的均值距离为（0.23±0.16）cm，其与大脑前动脉的均值夹角为（107.95±57.70）°。 结论 明确了大脑动脉环的解剖组成，测量了动脉间的距离及动脉环内各动脉间的角度，3D-TOF法磁共振血管成像可清晰显示大脑动脉环的组成，三维重建技术可以从各个角度显示大脑动脉环。

Objective To explore the use of three-dimensional time-of-flight (3D-TOF) magnetic resonance angiography of the cerebral arterial circle of the display case, and to provide morphological data for 3D visualization of arterial maps of the constructed basilar arterial circle. Methods Cerebral arterial circle was measured between artery angle and distance in 10 cadavers. The images of magnetic resonance angiography were got by 3D time-of-flight (3D-TOF) from 30 cases of normal human brain and were processed by Siemens Syngo B17 workstation, from medical imaging to analyze the cerebral arterial circle.
Results Display rate of the anterior cerebral artery was 100%, bilateral arrangement. The mean distance of the artery circle was (1.06±0.23) cm, the mean angle with internal carotid artery was (63.13±9.72)°, and the mean angle of the anterior communicating artery was (107.95±57.70)°. Display rate of the internal carotid arterial was 100%, and the mean angle of the anterior cerebral artery was (63.13±9.72)°, with the mean angle of the posterior communicating artery was (123.20±10.37)°. Display rate of the posterior cerebral artery was 100%, the mean distance of the artery circle was (0.56±0.12) cm, the mean angle of the posterior communicating artery was (70.00±8.87)°, and the mean angle of the basilar artery was (123.95±11.43)°. Display rate of the posterior communicating artery was 100%, the mean distance of the artery circle was (1.06±0.17) cm, and the mean angle of internal carotid artery was (123.20±10.37)°, and the mean angle of the posterior cerebral artery was (70.00±8.87 )°, and the mean angle of the middle cerebral artery was (131.15±15.21)°. Display rate of the anterior communicating artery was 80%, the mean distance of the artery circle was (0.23±0.16) cm, and with the mean of the anterior cerebral artery angle was (107.95±57.70)°. Conclusion This study confirms the anatomical composition of the cerebral arterial circle, measured the distance between the cerebral arteries, and measured the angle between the artery circle within the artery. The results show that 3D-TOF method magnetic resonance angiography can clearly display the composition of the cerebral artery circle, and three-dimensional reconstruction techniques from different angles display the cerebral artery circle.