Objective To assess the clinical value of dual‐source Flash Spiral CT Prospective ECG‐triggered sequence (step‐and‐shoot ,SAS) mode in cerebral angiography .Methods 60 patients with clinically suspected cerebral vascular dis‐ease underwent SAS‐CTA scan .60% R‐R interval of the ECG presentation mode was applied for data acquisition .After image processing of SAS‐CTA ,the scores of image quality were evaluated and the radiation dose was statistically analyzed . Results When AS‐CTA was evaluated ,the image quality score was 4 .72 ± 0 .50 ,the average effective dose was (0 .216 ± 0 .01) mSv .Compared radiation dose of SAS‐CTA with that of dual‐energy CTA (DE‐CTA) ,the effective dose was de‐creased by 76 .31% .Of these 60 patients with clinically suspected cerebral vascular diseases ,15 patients were diagnosed as intracranial aneurysm ,1 patient as arteriovenous malformation (AVM ) ,1 patients as moyamoya disease ,25 patients as cerebral artery stenosis or occlusion ,and the remaining 18 patients with negative results .Conclusion Application of pro‐spective ECG triggering sequence mode in cerebral angiography can guarantee the image quality ,meanwhile ,significantly reduce the radiation dose .%目的：探讨双源Flash Spiral CT 前瞻性心电触发序列（step‐and‐shoot ，SAS）模式脑血管成像的临床应用价值。方法将60例临床怀疑脑血管性病变的患者，行前瞻性心电触发序列模式的脑血管CTA（SAS‐CTA）扫描，采集期相：应用60％ R‐R间期的ECG演示模式，对SAS‐CTA做图像后处理，分析评价图像质量评分、统计辐射剂量。结果评价SAS‐CTA ，图像质量评分为4．72±0．50，平均有效剂量为（0．216±0．01）mSv ，SAS‐CTA有效辐射剂量与双能量CTA （DE‐CTA）比较降幅达到76．31％。60例临床怀疑脑血管病变患者，SAS‐CTA检出15例动脉瘤，1例动静脉畸形，1例烟雾病，25例脑血管狭窄或闭塞，18例阴性患者。结论前瞻性心电触发序列模式应用于脑血管成像，能准确诊断脑血管病变，可在保证图像质量的同时显著降低辐射剂量，有良好的临床应用价值。
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