中文摘要：

目的利用CT血管造影（CTA）追踪眼动脉走行，测量眼动脉眶内段平均管径，探讨CTA测量眼动脉管径的临床意义。方法回顾性分析25例行头颈部CTA未见颈动脉异常的患者的影像学资料。对不同性别患者眼动脉血管直径进行对比研究。CTA图像采用骨减影后，进行颈动脉和眼动脉3D重建，得到容积再现（VR）、多平面重组（MPR）和最大密度投影（MIP）图像后测量眼动脉直径。结果沿颈内动脉可准确追踪眼动脉走行；男性眼动脉眶内段管径1．29±0．48mm，女性管径为1．27±0．36mm，性别间无显著性差异（P=0．188）。结论CTA较清晰地显示眼动脉的形态，同时能够准确的测量眼动脉的管径，可以作为．G44性检测眼动脉疾病的重要方法。正常眼动脉直径测量可以为有眼动脉形态改变的相关疾病的诊断提供有价值的影像学依据。

英文摘要：

Objective To explore the feasibility of using computed tomographic angiography( CTA)to measure the diameter of ophthal-mic artery. Methods A retrospective analysis had been performed with clinical data of 25 patients with normal internal carotid arteries confirmed by computer tomographic angiography. The OA was identified by multiplanar CT reformations. The diameter of OA of patients had been compared between males and females. Results All ophthalmic arteries were detected by 3D volume-rendering(VR)CTA. Bone subtraction was success-ful in all patients. The mean diameter of OA was 1. 29 ± 0. 48 mm in men,and 1. 27 ± 0. 36 mm in women( P =0. 188 for gender). Conclusion Computed tomographic angiography is a reliable method for visualizing the ophthalmic artery. There is no major gender difference in diameter of OA.