一楔合成楔形板的楔形板因子(WF)与射野大小及不规则野的关系  

Effects of field size and asymmetric field on wedge factor of autowedge in wedge field

作　　者：余增荣[1] 

机构地区：[1]广东省江门市中心医院肿瘤科,广东江门529030

出　　处：《中国医学工程》2005年第4期358-359,共2页China Medical Engineering

摘　　要：目的探讨楔形因子与射野大小及不规则射野之间的关系。方法用PTW剂量仪及电离室对北京医研所BJ-6B直线加速器的一楔合成60°楔形板不同照射野及不规则射野的楔形因子进行测量。结果BJ-6B直线加速器一楔合成楔形板其楔形因子随射大小变化而变化,并且其楔形因子随不规则射野的变化,X和Y方向上都有变化。结论在放射治疗计算中,一定要重视射野大小及不规则野对楔形因子的影响。[Objective] The effects of field size and asymmetric field on wedge factors are studied. [Method] The measurment of wedge factors were performed for 60° autowedge of the BJ-6B linear accelerator for field size from 4 cm×4 cm up to 18 cm×18 cm and asymmetric field. [Result] Wedge factors had an obvious dependence on the field size, and although dependence on the asymmetric field. [Conclusion] In clinical dose calculation, it is significant to use relative field size wedge factors. It should be adjusted that effect of field size and asymmetric field on wedge factors.

关 键 词：楔形板 一楔合成 楔形因子 射野大小 不规则野 

分 类 号：R730.55[医药卫生—肿瘤]