目的 :评价 CT仿真血管内镜的临床应用价值及限度。方法 :2 5例患者进行了螺旋 CT增强扫描。其中腹主动脉瘤 6例 ,主动脉夹层 7例 ,肺癌纵隔淋巴结肿大压迫血管 4例 ,颈部炎性淋巴结肿大压迫血管 1例 ,部分肺静脉异位引流 1例 ,右大脑中动脉瘤 1例 ,正常血管 5例。扫描参数 :层厚 3～ 7mm,螺距 1.5～ 2 .5。重建间隔 1.5～ 2 mm。然后输入工作站进行血管内腔、二维、多平面体积重组 (MPVR)、表面阴影遮盖法 (SSD)及最大密度投影 (MIP)重建。结果 :CT仿真血管内镜能清晰的显示血管内表面及正常和异常血管开口、异常血管孔道夹层动脉瘤的内膜片及真假腔等。结论 :CT仿真血管内镜作为一种无创诊断手段 ,与其他三维重建技术综合运用 ,对血管性病变可为临床提供更多的信息 Objective: To evaluate the clinical value and limits of CT virtual endoscopy. Methods: Twenty-five patients underwent spiral CT enhanced scan. Among them, there were 6 cases of abdominal aortic aneurysm, 7 cases of aortic dissection, 4 cases of oppression of mediastinal lymph nodes in lung cancer, 1 case of oppression of cervical lymph node, 1 case of pulmonary venous drainage, 1 case of right middle cerebral artery aneurysm For example, 5 cases of normal blood vessels. Scan parameters: layer thickness 3 ~ 7mm, pitch 1.5 ~ 2 .5. Reconstruction interval 1.5 ~ 2 mm. The workstation was then entered for vascular lumen, two-dimensional, multiplanar volume reconstruction (MPVR), surface shadow masking (SSD) and maximum density projection (MIP) reconstruction. Results: CT virtual endoscopy can clearly show the inner surface of blood vessels and normal and abnormal vascular openings, abnormal vessels in the aneurysm dissection and true and false lumen and so on. Conclusion: CT virtual endoscopy as a non-invasive diagnostic tool, combined with other three-dimensional reconstruction techniques, for vascular lesions can provide more information for clinical