直接发自主支气管的支气管支，于其行程中又发出许多更小的支气管，这些小支气管继续又呈分杈状而分为许多更小的支气管。结果全体构成类似分支系统非常复杂的倒置的一株大树，故名支气管树。支气管树上的各级支气管既有着共同的一般结构，又有着各自的结构特点，并随着管径的由粗变细，管壁的结构变化有着一定的规律性。
外源性是指脂质源于体外，而后被吸入到支气管树。
The term exogenous refers to the origin of the lipid material outside the body. This material is aspirated into the bronchial tree.
本文建立了一个更能反映肺支气管树三维特征的模型。
A three-dimensional model was developed in this thesis, in which the lung airway tree's characteristics can be described better.
结论3d支气管树重建图像对SPN具有辅助诊断价值。
Conclusion 3d bronchial tree reconstruction images have supplementary diagnostic value for SPN.
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