关于X和γ射线束楔形板剂量的修正算法  

The Correction Algorithem of Doses of Wedge for X and γ Rays

作　　者：杨代伦[1] 罗正明[1] 

机构地区：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,成都610064

出　　处：《四川大学学报（自然科学版）》2003年第5期901-904,共4页Journal of Sichuan University(Natural Science Edition)

摘　　要：利用加速器治疗肿瘤时,通常要在射线束的路径上加入楔形板以改变平野的剂量分布.作者研究了用衰减系数法计算加楔形板后的剂量修正算法.即通过测量楔形板的材料衰减系数,再根据楔形板剖面的尺寸大小,建立插值算法以计算射线穿透楔形板的路径长度,从而准确地计算射线楔衰减因子修正平野的剂量.When an accelerator is used to treat tumour of illness, the distribution of doses is changed by commonly inserting a wedge into the path of radial beam. The authors have proposed the correction algorithm of the attenuation of radial doses due to inserting wedge. By means of measured attenuation coefficient of material of wedge, and the sizes of the wedge section, the path of radial beam through the wedge is calculated by the linearity interpolation algorithem and the distribution of the radial doses without wedge is corrected.

关 键 词：治疗计划系统 剂量算法 楔形板剂量修正 

分 类 号：R815[医药卫生—放射医学] TL72[医药卫生—临床医学]