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目的：评价电子束ＣＴ三维血管重建在诊断颅内动脉瘤中的价值与限度。材料和方法：采用ＩｍａｔｒｏｎＣ－１５０型电子束成像系统，对３１例可疑动脉瘤患者进行了ＥＢＣＴＡ和ＤＳＡ对照研究。结果：发现２３例共２４个动脉瘤，包括３例术后随访病人。ＥＢＣＴＡ上发现动脉瘤最小直径为５ｍｍ，最大直径为４１ｍｍ，其中１例ＤＳＡ阴性，而ＣＴＡ阳性，ＥＢＣＴＡ假阳性１例，假阴性２例。ＥＢＣＴＡ诊断动脉瘤的敏感度９２．０％，特异度８８．９％，准确度９１．２％，阳性预测值９５．８％，阴性预测值８０．０％，同时分析了ＥＢＣＴＡ误、漏诊原因。结论：ＥＢＣＴＡ能够明确瘤体的部位、瘤颈、载瘤动脉以及与周围邻近结构的关系，是诊断、筛选动脉瘤以及术后随访的有效手段，在某些方面可以替代甚至超过ＤＳＡ，当病变在ＤＳＡ上不显影时，ＣＴＡ不失为一种补充检查方法。ＭＩＰ和ＳＳＤ两种重建方法各有优缺点，应该相互补充，综合应用
Objective: To evaluate the value and limitation of three-dimensional electron-beam CT in the diagnosis of intracranial aneurysms. Materials and Methods: EBCTA and DSA control studies were performed on 31 patients with suspected aneurysms using the Imatron C-150 electron beam imaging system. Results: A total of 24 aneurysms were found in 23 patients, including 3 patients who were followed up. Aneurysm was found on EBCTA with a minimum diameter of 5mm and a maximum diameter of 41mm, of which 1 was negative for DSA, 1 was positive for CTA, 1 was false positive for EBCTA, and 2 was false negative. The diagnostic accuracy of EBCTA was 92.0%, specificity of 88.9%, accuracy of 91.2%, positive predictive value of 95.8% and negative predictive value of 80.0%. The causes of EBCTA misdiagnosis and misdiagnosis . Conclusion: EBCTA can clarify the location of the tumor, the neck of the tumor, the parent artery and its relationship with the adjacent structures. It is an effective method to diagnose and screen the aneurysms and follow-up. In some aspects, EBCTA can replace and surpass DSA. CTA is a complementary test when not developing on DSA. Both MIP and SSD reconstruction methods have their own advantages and disadvantages, which should be complemented with each other and comprehensively applied