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选用已发表的百分深度剂量表应与所使用的治疗机条件一致,如千伏、过滤、源(焦)皮距等。中能 X 线百分深度剂量表分适用于光栏(Diaphragm)及照射筒两大类,照射筒又分为封闭式及开放式两大类,应按治疗的具体情况选用。同位素治疗机(如~(60)钴、铯~(137)):源的几何形状及结构、机壳及准直系统都要影响射线量,改变到达体模或机体的射线谱组
The published percentage of depth dose table should be consistent with the conditions used in the treatment machine, such as kV, filtration, source (focal) pitch and so on. The X-ray depth dose table of X-ray can be divided into two categories: Diaphragm and Irradiation Canister. The irradiation canister is divided into two categories: closed and open. It should be selected according to the specific conditions of treatment. Isotope treatment machines (such as ~(60)cobalt, cesium(137)): The geometry and structure of the source, the housing, and the collimation system all influence the amount of radiation and change the ray spectrum arriving at the phantom or body.