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目的：为左、右肺上叶、段支气管及右肺中叶、段支气管的ＣＴ显示提供解剖学基础。方法：用３０具成人标本的左、右肺支气管树及其中左、右肺各１３例ＣＴ影像进行观测。结果：左、右肺上叶支气管及右肺中叶支气管的内径分别为５．２±０．６ｍｍ、５．１±０．９ｍｍ和４．０±０．６ｍｍ。段支气管内径为２．３～２．６ｍｍ。左肺Ｂ１＋２、Ｂ３的夹角分别为１８２．８°±３．６°和９２．０°±５．０°；右肺Ｂ１、Ｂ２、Ｂ３、Ｂ４和Ｂ５的夹角分别为１７３．８°±１４．３°、９２．２°±２．０°、８１．５°±４．５°、４０．５°±１０．１°和４５．５°±１１．０°。结论：可为ＣＴ诊断提供一个以数据为依据确定支气管异常的方法，通过调整段支气管与ＣＴ扫描层面间的夹角，可提高斜位ＣＴ扫描显示率。
OBJECTIVE: To provide anatomical basis for CT findings of left and right upper lobe, segment bronchus, middle lobe of right lung and segment bronchus. Methods: Left and right lung bronchial tree of 30 adult specimens and CT images of 13 left and right lungs were observed. Results: The diameters of the bronchus in the left and right lung lobes and the middle lobe of right lung were 5.2 ± 0.6 mm, 5.1 ± 0.9 mm and 4.0 ± 0.6 mm, respectively. Section bronchus diameter of 2.3 ~ 2.6mm. The included angles of the left lungs B1 + 2 and B3 are respectively 182.8 ° ± 3.6 ° and 92.0 ° ± 5.0 °. The included angles of the right lungs B1, B2, B3, B4 and B5 are respectively 173.8 ° ± 14.3 °, 92.2 ° ± 2.0 °, 81.5 ° ± 4.5 °, 40.5 ° ± 10.1 ° and 45.5 ° ± 11.0 °. Conclusion: It is possible to provide a data-based method for the diagnosis of bronchial abnormalities in CT diagnosis. By adjusting the angle between the bronchus and the CT scan plane, the CT scan display rate can be increased.