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目的探讨ＣＴ仿真内窥镜成像技术的原理、方法及临床应用价值。材料与方法将螺旋ＣＴ容积扫描数据传输到工作站。通过软件功能调整ＣＴ值阈值和透明度，显示含气器官或主动脉的内腔，赋予人工伪彩色，重建出沿空腔器官中轴行程一致的多幅器官内表面图像。再用电影功能依次回放，获得仿真内窥镜效果。用此方法检查２１例患者及正常人，其中喉部８例，气管支气管３例，结肠５例，主动脉５例。全部病例均经纤维内窥镜或手术病理证实。结果喉、气管支气管及结肠ＣＴ仿真内窥镜获得类似纤维内窥镜显示管腔器官腔壁或腔内病变形态的效果。尚能从梗阻远端观察病变情况。主动脉ＣＴ仿真内窥镜能显示血管内壁、假性动脉瘤的破口、夹层动脉瘤的内膜瓣。结论ＣＴ仿真内窥镜提供了一种无创伤性的诊断方法，可作为纤维内窥镜的补充手段，但其敏感性及特异性有待今后进一步研究提高。
Objective To explore the principle, method and clinical value of CT virtual endoscopy. Materials and Methods Spiral CT volume scan data was transmitted to the workstation. The software adjusts CT thresholds and transparencies to show the lumen of gas-filled organs or aortas, giving artificial false color and reconstructing images of the internal surfaces of multiple organs along the axis of the hollow organ. Then use the movie features in turn playback, simulation results obtained endoscopy. Twenty-one patients and normal subjects were examined by this method. Among them, 8 were throat, 3 were tracheobronchial, 5 were colon and 5 were aorta. All cases were confirmed by fiber endoscopy or surgical pathology. Results Throat, tracheobronchial and colon CT simulation endoscopy obtained the similar effect of fiber endoscopy on the luminal lumen wall or intraluminal lesion morphology. Obstacles can still observe the distal lesions. Aorta CT simulation endoscopy can show the vascular wall, the break of the pseudoaneurysm, dissection aneurysm intimal flap. Conclusion CT virtual endoscopy provides a noninvasive diagnostic method that can be used as a supplementary means of fiber endoscopy, but its sensitivity and specificity to be further studied in the future.