The equivalent radius error sensitivity evaluation system is introduced to analyze the effects of error space when different dimensional errors are put on operative mechanism.
引入等效半径的误差敏度评价体系，分析不同量纲误差对执行端误差空间的影响。
It can be used in measuring not only dimensional and shape errors, but also relative positions as in the cases of perpendicularity, parallelness, conicity, distance between holes, etc.
它不仅能测量尺寸、形状误差，还可以测量垂直度、锥度、孔中心距、平行度等相互位置误差。
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。
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