This program is mainly extract the skeleton endpoints and branch points, and methods used in single-contour tracking list.

本程序主要是提取骨架的端点和分支点，方法采用的是单链表轮廓跟踪。

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The vessel skeleton was recursively tracked to generate the feature tree and the tree was traversed consequently to pick up the branch points and end points.

先通过预处理提取出血管并进行三维细化，再递归跟踪血管骨架生成特征树并进行遍历提取出血管的分支点和端点。

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Spurious branches of a skeleton are adaptively removed through the distance threshold and the branch length threshold.

骨架上的杂枝也可通过距离阈值和长度阈值予以删除。

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