在椎间孔外区，后支主干及其分支与出口腰神经前支的关系密切，血管呈“树叉”状从外侧将神经包绕。

In the out space of the foramens, the posterior branches located laterally to the exiting nerve and formed an "arbor" around it.

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同时根据二叉树的前序遍历结果匹配血管段，有效地提高了匹配的速度和准确度。

Vessel segments in two images are matched by the preorder traversal of the binary trees, and the method is proved fast and accurate.

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结果：32例单侧三叉神经痛及面肌痉挛的MRTA中，确认患侧有“血管压迫”28例，无血管压迫4例。

Result: Of the unilateral TGX and HFS' s MRTA findings, 28 of 32 cases were confirmed to be the symptomatic side with the vascular compression, except 4 cases.

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