Objective: To examine and analyze the set-up errors for patients with three dimensional conformal and Intensity Modulated Radiotherapy to calculate CTV referential safety margins of PTV.
目的：测定和分析三维适形及调强放疗的摆位误差，并依此计算CTV外扩PTV边界的大小。
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。
Based on the part surface errors and fixture setup errors, locating error model of three-dimensional part is built.
基于定位点处的尺寸偏差，建立了三维零件的定位误差模型。
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