Objective: Measuring the secure depths and angles of Yamen acupoint with three-dimensional positioning MRI to provide the reference datas of secure depths and angles for clinic.
目的：通过使用三维定位MRI测量哑门穴进针的安全深度、角度，为临床提供安全针刺深度和角度的参考数据防止意外事故发生。
Surveying or land surveying is the technique and science of accurately determining the terrestrial or three-dimensional space position of points and the distances and angles between them.
测勘或者土地测勘是指精确测量地面或者立体坐标、距离、角度的一种技术。
In reflective light path, because of the errors in assembling, planar reflector would have three tiny dimensional angles stray.
在折转光路中，由于安装误差，平面反射元件会存在三维方向的微偏角。
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