Abstract：
OBJECTIVE: The prospective study aimed to examine the central retinal artery (CRA) using computed tomography (CT).
METHODS: Seventy adult outpatients comprising 32 men and 38 women, at a mean age of 60.6 ± 13.3 years, were enrolled in the study. The patients underwent contrast-enhanced CT. The scan timing was set to start 5.0 s after the circle of Willis began to be delineated.
RESULTS: The ophthalmic arteries (OphAs) were comfortably delineated in all. In 97% of the patients, the CRA was delineated from the original site on the OphA to a more distal segment coursing on the optic sheath. Unilateral and bilateral CRA delineations were observed in 44% and 53% of cases, respectively. The delineated CRAs demonstrated highly variable morphologies in terms of the course and length on the optic sheath. In addition, the distance between the original site of the CRA and the posterior limit of the bulb was measured. The mean distance was 18.6 ± 5.0 mm on the right and 17.8 ± 4.3 mm on the left, respectively. No significant right-to-left differences in the measurements (p > 0.05) were observed.
CONCLUSIONS: If optimal scan timing is adopted, the CRA segments coursing on the optic sheath can be delineated using contrast-enhanced CT. CT may be a useful diagnostic modality for the CRAs and associated pathological conditions.
METHODS: Seventy adult outpatients comprising 32 men and 38 women, at a mean age of 60.6 ± 13.3 years, were enrolled in the study. The patients underwent contrast-enhanced CT. The scan timing was set to start 5.0 s after the circle of Willis began to be delineated.
RESULTS: The ophthalmic arteries (OphAs) were comfortably delineated in all. In 97% of the patients, the CRA was delineated from the original site on the OphA to a more distal segment coursing on the optic sheath. Unilateral and bilateral CRA delineations were observed in 44% and 53% of cases, respectively. The delineated CRAs demonstrated highly variable morphologies in terms of the course and length on the optic sheath. In addition, the distance between the original site of the CRA and the posterior limit of the bulb was measured. The mean distance was 18.6 ± 5.0 mm on the right and 17.8 ± 4.3 mm on the left, respectively. No significant right-to-left differences in the measurements (p > 0.05) were observed.
CONCLUSIONS: If optimal scan timing is adopted, the CRA segments coursing on the optic sheath can be delineated using contrast-enhanced CT. CT may be a useful diagnostic modality for the CRAs and associated pathological conditions.
摘要：
目的：前瞻性研究旨在使用计算机断层扫描（CT）检查视网膜中央动脉（CRA）。
方法：70名成人门诊患者，包括32名男性和38名女性，平均年龄为60.6±13.3岁，参加了这项研究。患者行对比增强CT检查。扫描定时设置为在开始描绘Willis的圆之后5.0s开始。
结果：眼动脉（OphAs）均被舒适地描绘。在97%的患者中，CRA从OphA的原始位置到光学鞘上更远的部分。在44％和53％的病例中观察到单侧和双侧CRA勾画，分别。描绘的CRA在光学鞘上的路线和长度方面表现出高度可变的形态。此外,测量CRA原始位置与灯泡后限之间的距离。右侧平均距离18.6±5.0mm,左侧平均距离17.8±4.3mm,分别。在测量中没有观察到显著的从右到左差异(p>0.05)。
结论：如果采用最佳扫描时序，可以使用对比增强CT描绘光学鞘上的CRA节段。CT可能是CRA和相关病理状况的有用诊断方式。
方法：70名成人门诊患者，包括32名男性和38名女性，平均年龄为60.6±13.3岁，参加了这项研究。患者行对比增强CT检查。扫描定时设置为在开始描绘Willis的圆之后5.0s开始。
结果：眼动脉（OphAs）均被舒适地描绘。在97%的患者中，CRA从OphA的原始位置到光学鞘上更远的部分。在44％和53％的病例中观察到单侧和双侧CRA勾画，分别。描绘的CRA在光学鞘上的路线和长度方面表现出高度可变的形态。此外,测量CRA原始位置与灯泡后限之间的距离。右侧平均距离18.6±5.0mm,左侧平均距离17.8±4.3mm,分别。在测量中没有观察到显著的从右到左差异(p>0.05)。
结论：如果采用最佳扫描时序，可以使用对比增强CT描绘光学鞘上的CRA节段。CT可能是CRA和相关病理状况的有用诊断方式。
