The point at which branching of the graph occurs is called a bifurcation point and corresponds to a critical value of the load. 圖上發生分叉處的點叫分支點，它相當於荷載的臨界值。
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. 先通過預處理提取出血管並進行三維細化，再遞歸跟蹤血管骨架生成特徵樹並進行遍歷提取出血管的分支點和端點。
Is the log sequence number of the current fork point. 是當前分叉點的日誌序列號。
