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目的:探讨多层螺旋CT血管成像（CTA）对蛛网膜下隙出血（SAH）成像特点及病因诊断的临床应用价值。方法:选择2018年7月至2019年12月在浙江省新昌县人民医院诊治的SAH患者68例作为研究对象，所有研究对象均进行CTA及数字减影脑血管造影（DSA）检查，比较CTA与DSA的检测结果。结果:以DSA结果为“金标准”，68例SAH患者中，DSA正确检出动脉瘤44例，动静脉畸形16例，正常8例。CTA正确检出61例，其中检出动脉瘤45例，动静脉畸形16例，正常7例，误诊1例动脉瘤，诊断符合率为98.53%（67/68）。CTA和DSA在检测瘤体宽度及瘤颈宽度方面比较差异无统计学意义[（6.63 ± 0.75）mm比（6.58 ± 0.77）mm、（3.55 ± 0.47）mm比（3.49 ± 0.45）mm]（n P > 0.05）。n 结论:CTA对SAH的病因诊断具有无创、快速、便捷等优点，有助于临床手术治疗方法的选择和难度的评估。“,”Objective:To evaluate the imaging characteristics and etiology of subarachnoid hemorrhage (SAH) by multi-slice spiral CT angiography (CTA).Methods:A total of 68 SAH patients admitted to Xinchang People′s Hospital from July 2018 to December 2019 were selected as study subjects. CTA and digital subtraction angiography (DSA) were performed on all subjects to compare the detection results of CTA and DSA.Results:Taken DSA results as the “gold standard”, this study included 68 SAH patients, including 44 cases of aneurysm detected by DSA correctly, 16 cases of arteriovenous malformation and 8 cases of normal. CTA correctly detected 61 cases, including 45 cases of aneurysms, 16 cases of arteriovenous malformations and 7 cases of normal cases. One case was misdiagnosed as aneurysm, and the diagnosis coincidence rate was 98.53% (67/68). There was no significant difference between CTA and DSA in the detection results of tumor body width and neck width [(6.63 ± 0.75) mm vs. (6.58 ± 0.77) mm, (3.55 ± 0.47) mm vs. (3.49 ± 0.45) mm] (n P > 0.05).n Conclusions:CTA has the advantages of non-invasive, rapid and convenient diagnosis of the etiology of SAH, which is conducive to the selection and assessment of clinical surgical treatment.