摘要
目的:正确理解和应用放疗中一维点剂量的处方剂量计算及其过程。方法:(1)根据肿瘤内参考点的组织剂量及其在人体内的深度和PDD(或TMR),计算出人体内射野中心轴上最大剂量点的剂量。(2)对实际射野相对于参考射野的不同而引起的散射线改变的校正。(3)对等中心和非标称SSD照射时的SAD、SSD因子的校正。(4)使用楔形板对楔形照射野的剂量计算。(5)对射野内离轴点的处方剂量的计算。结果:本文对放疗中常规的处方剂量从理论到实例上都给出了较为详尽的一维点剂量的计算结果。结论:一维点剂量的处方剂量计算对于规则野或简单的不规则野十分快捷,它是复杂的二维、三维剂量计算的理论基础。
Purpose： To understand and apply the calculation and process of prescription dose with one- dimensional point dose in radiotherapy.Method： （1） Calculating the dose served to the maximum dose point of intracorporally central field axis, based on the tissue dose, the degree of intracorporal depth and DPP （or called TMP） of reference point in tumour. （2） Correcting the changing of scattered rays caused by the dissimilarity of actual field and reference field. （3） Calibrating the SAD and SSD factor produced by the irradiation of either isocenter or non - nominal SSD. （4） Using wedge - shaped plate calculating the dose of wedge - shaped field. （5） Calculating the prescription dose neared the field axis point.Results： This paper gives the elaborate Calculating result of one - dimensional point dose from the aspect of theory and living example in prescription dose of normal radiation treatment. Conclusion： The calculation of prescription dose of one - dimensional point dose is a shortcut for regular and simply irregular field. It is the theoretical principle of two and three - dimensional point dose calculation that are more complicated.
出处
《医疗装备》
2009年第5期1-10,共10页
Medical Equipment
