目的 数字减影CT血管成像 (DSCTA)和低场强MRI诊断蛛网膜下腔出血 (SAH)的价值及影像特点分析。方法 选 择2014年1月到2018年1月到医院就诊SAH 患者85例，所有患者均进行DSCTA、低场 强MRI检查。以脑血管造影(DSA)为金标 准，统计DSCTA及低场强MRI诊断效能，统 计DSCTA及低场强MRI对不同病因SAH检出 率，统计DSCTA及低场强MRI对不同部位动 脉瘤检出率，统计DSCTA及低场强MRI对不 同大小动脉瘤检出率。结果 DSCTA对SAH 诊断准确率92.94%，特异度80.00%，灵敏 度93.75%；低场强MRI对SAH诊断准确率 90.59%，特异度80.00%，灵敏度91.25%； DSCTA在颅内动脉瘤检出率高于低场强 MRI(P＜0.05)；DSCTA及低场强MRI两种检 测方式在不同部位、大小动脉瘤检出率差 异无统计学意义(P＞0.05)。结论 DSCTA 及低场强MRI均对SAH有较高诊断效能，其 中DSCTA可提升血管对比度且可去除骨结 构干扰，对动脉瘤检出率更高。

Objective To analyze the value and imaging features of digital subtraction CT angiography (DSCTA) and low field intensity MRI in the diagnosis of subarachnoid hemorrhage (SAH). Methods 85 cases of patients with SAH in the hospital from January 2014 to January 2018 were selected. All patients were given DSCTA and low field intensity MRI. The cerebral angiography (DSA) was taken as the gold standard, and the diagnostic efficacy of DSCTA and low field intensity MRI was counted, and the detection rates of SAH with different causes were counted by DSCTA and low field intensity MRI, and the detection rates of different sites of aneurysms by DSCTA and low field intensity MRI were counted, and the detection rates of different sizes of aneurysms by DSCTA and low field intensity MRI were counted. Results The diagnostic accuracy, specificity and sensitivity of DSCTA for SAH were 92.94%, 80.00% and 93.75% respectively. The diagnostic accuracy, specificity and sensitivity of low field intensity MRI for SAH were 90.59%, 80.00% and 91.25%. The detection rate of intracranial aneurysm by DSCTA was higher than that of low field intensity MRI (P<0.05). There were no significant differences in the detection rates of aneurysms of different sites and sizes by DSCTA and low field intensity MRI (P>0.05). Conclusion Both DSCTA and low field intensity MRI have high diagnostic efficacy for SAH. DSCTA can improve blood vessel contrast and remove bone structure interference, and has high detection rate of aneurysms.