目的　通过对 73例气管、支气管树三维重建的临床应用进行回顾性分析 ,探讨CT气管、支气管树三维重建的临床应用前景。方法　搜集自 1997年 10月至 2 0 0 0年 2月共 73例伴气管、支气管病变或其邻近病变患者。所有研究对象均接受电子束CT(EBCT)扫描。扫描条件 :130kV ,6 30mA ,层厚为 1 5或 3 0mm ,扫描方式为连续容积扫描。其横断面图像转入INSIGHT工作站进行三维重建 ,重建方式为表面遮盖显示法 (SSD)。重建阈值为 - 5 0 0～ - 30 0HU。结果　EBCT气管、支气管树三维重建可显示不同病变引起的气管、支气管树的异常形态改变 ,包括中央型肺癌、炎症、支气管扩张、剑鞘气管、气管癌、先天性异常、肺癌术后等 ,以及气道邻近的良、恶性病变所引起的气道狭窄。可用于确定狭窄的部位、范围和程度。 35例中央型肺癌的SSD三维重建 :6例表现为支气管杵状中断 ,15例为锥状中断 ,5例为截断且断端不规则 ,8例为不规则偏心性狭窄 ,1例为右主支气管的裂开和右上叶支气管的截断。结论　EBCT气管、支气管树三维重建其有特征的征象用于中央气道良、恶性病变的诊断和鉴别诊断 ;CT气管、支气管树三维重建有一定的临床指导价值 Objective To retrospectively analyze the clinical application of three-dimensional reconstruction of tracheal and bronchial trees in 73 cases to explore the clinical application of three-dimensional reconstruction of tracheobronchial and bronchial tree of CT. Methods Totally 73 patients with bronchial or bronchial lesions or adjacent lesions were collected from October 1997 to February 2000. All subjects underwent electron beam computed tomography (EBCT) scans. Scanning conditions: 130kV, 6 30mA, layer thickness of 15 or 30mm, scanning mode for continuous volume scanning. The cross-sectional images were transferred to the INSIGHT workstation for 3D reconstruction using a surface-covered display (SSD) method. The reconstruction threshold is - 5 0 0 ~ - 30 0HU. Results Three-dimensional reconstruction of the trachea and bronchial tree of EBCT showed abnormal changes of the trachea and bronchial tree caused by different pathologies including central lung cancer, inflammation, bronchiectasis, scabbard trachea, tracheal cancer, congenital anomalies, postoperative lung cancer, etc. Airway adjacent to the good and malignant lesions caused by airway stenosis. Can be used to determine the site, extent and extent of stenosis. Three-dimensional reconstruction of SSD in 35 patients with central lung cancer: Six patients showed bronchial clubbing interruption, 15 cases were cone-shaped interruption, 5 cases were truncated and irregular ends, 8 cases were irregular eccentric stenosis and 1 case was right main Bronchial rupture and the right upper lobe bronchial truncation. Conclusion Three-dimensional reconstruction of the trachea and bronchial tree of EBCT has its characteristic signs for the diagnosis and differential diagnosis of benign and malignant lesions in the central airway. The three-dimensional reconstruction of CT trachea and bronchial tree has certain clinical value