目的 探讨小剂量对比剂联合生 理盐水128层螺旋CT头颈部血管成像技术 在头颈血管病变筛查中的价值。方法 对 75例拟诊头颈部血管病变患者，采用小 剂量对比剂进行头颈部CTA检查，将扫描 后图像传至工作站进行CTA重建，分别对 CTA图像质量及病变显示效果进行分析。 结果 本组低剂量对比剂头颈部CT血管成 像(CTA)检查图像质量均达到诊断要求， 颈部动脉显示优良率82.6%，脑部动脉显 示优良率81.3%，头颈部血管病变显示清 楚；75例中正常23例；异常52例，其中脑 动脉瘤32例(共38个动脉瘤)，脑血管畸形 (AVM)2例，脑血管硬化13例，颈内动脉阻 塞3例，烟雾病2例。结论 采用小剂量对 比剂联合生理盐水进行头颈部血管128层 螺旋CT成像(CTA)检查，能够获取满足诊 断要求的图像质量，在不影响诊断结果的 前提下有效降低对比剂用量，有利于降低 对比剂不良反应发生的可能。

Objective To evaluate the clinical value of low dose contrast agent CT angiography (CTA)in the diagnosis of head and neck vascular diseases. Methods A total of 75 patients who were suspected of head and neck vascular disease accepted head and neck CTA examination by low dose contrast agent. The imaging quality and the effect of lesion display were analyzed. Results The quality of all images met the diagnostic requirements. The excellent rate of images quality of carotid artery and cerebral arteries were 82.6% and 81.3% respectively. The results included 32 cases of aneurysms, 2 cases of vascular malformation, 13 cases of cerebral arteriosclerosis, 3 cases of carotid obstruction, and 2 cases of moyamoya. Conclusion The 128-slice spiral CT imaging of head and neck vessels with low-dose contrast agent can obtain the image quality that meets the diagnostic requirements, and reduce the dosage of contrast agent without affecting the diagnostic results effectively, which is conducive to reducing the possibility of adverse reactions of contrast agent.