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对给定的皮肤野面积,由于SSD的变化(拉长或缩短)会影响靶区(内野)的照射野面积。非模拟机定位时因焦-皮-屏距与治疗用~(60)Co机、加速器的技术参数不一致,所获取的临床数据与待上机治疗时实际应用的数据各有差异,一旦治疗机的SSD发生改变(如源强衰减采用缩短SSD的方法满足剂量率的要求或某治疗机故障换机等)则无法对变化的靶区面积予以修正,这种变化造成的误差为临床治疗所不允许。以SSD100cm改为65cm为例。皮肤野边长均为10cm,肿瘤深度10cm,求两种不同的
For a given skin area, the area of the irradiation field of the target (infield) will be affected by changes in SSD (lengthening or shortening). Non-simulator positioning due to the coke - skin - screen with the treatment of ~ (60) Co, accelerator technical parameters are inconsistent, the clinical data obtained and the actual treatment to be on the machine when the data are different, once the treatment machine Of the SSD (such as the source of strong decay by shortening the SSD method to meet the dose rate requirements or a treatment machine failure replacement, etc.) will not be able to change the target area to be corrected, the error caused by this change is not for clinical treatment allow. Take SSD100cm instead of 65cm as an example. The length of the skin side are 10cm, tumor depth 10cm, seeking two different