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。
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。
Then obtained the feature points such as endpoints and branch points of the skeleton, recorded their connecting relationship.
然后找出骨架中端点、分支点等特征点并记录它们的连接关系；
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