目的　观察常见肺部疾患的CT仿真支气管镜征象 ,探讨有关成像技术。方法　选择因肺部疾患接受胸部CT检查的 5 7例患者行螺旋CT薄层扫描 ,将重建后的图像源容积数据传输至同机工作站 ,应用机内图像分析软件选择适当成像方式及阈值模式最终获取仿真支气管内窥镜图像资料。病例均经纤维支气管镜、穿刺活检、手术或临床综合诊断。结果　肺癌 2 3例 ,肺结核 8例 ,肺癌切除术后 6例 ,肺部感染及放射性肺炎 16例 ,支气管扩张症 4例。CTVB显示气管、支气管各种病理征象共 81处 ,与纤支镜对照其敏感性为 82 %。结论　通过仿真支气管内窥镜成像可清晰地显示多种肺部疾患所造成的气管、支气管腔内病理征象 ;合理选择成像阈值 ,优化扫描及重建参数可明显改善图像质量 ,提高其敏感性 Objective To observe the CT bronchoscopy signs of common lung diseases and discuss the related imaging techniques. Methods Fifty-seven patients undergoing chest CT examination for lung disease underwent spiral CT thin-layer scanning, and the reconstructed image source volume data was transmitted to the same workstation. The intra-computer image analysis software was used to select the proper imaging mode and threshold mode Obtain simulated bronchoscopy images. All cases were diagnosed by fiberoptic bronchoscopy, biopsy, surgery or clinical diagnosis. Results There were 23 cases of lung cancer, 8 cases of pulmonary tuberculosis, 6 cases of lung cancer after resection, 16 cases of pulmonary infection and radiation pneumonitis, and 4 cases of bronchiectasis. CTVB showed tracheal, bronchial pathological signs of a total of 81, with bronchoscopy control of its sensitivity was 82%. Conclusion Simulation of endoscopic bronchoscopy can clearly show pathological signs of trachea and bronchus caused by various lung diseases. Reasonably selecting imaging threshold, optimizing scanning and reconstruction parameters can obviously improve the image quality and improve the sensitivity