高剂量率后装放疗辐射场的最优化研究  

Study on Optimization of Rradiation Field for High Dose Rate Afterloading Radiotherapy

作　　者：邓君[1] 曹磊[1] 王晓刊[1] 王成国[2] 林志凯[1] 王建超[1] 练德幸[1] 

机构地区：[1]中国疾病预防控制中心辐射防护与核安全医学所,辐射防护与核应急中国疾病预防控制中心重点实验室,北京100088 [2]内蒙古疾病预防控制中心,呼和浩特010031

出　　处：《辐射防护》2013年第3期185-188,共4页Radiation Protection

摘　　要：以某一高剂量率(HDR)后装治疗室为对象,利用蒙特卡罗程序计算放射源处于治疗室不同位置时迷宫内入口、迷宫内入口第一转折和迷宫外入口处γ辐射水平,分析研究放射源位置对迷宫内辐射场分布的影响,并通过现场实验检验其可靠性。结果表明,放射源位置对迷宫内辐射场分布有较大影响,在治疗室东侧且靠近迷宫内墙的区域时,迷宫外入口剂量相对较小,可推荐为治疗时放射源的最优化位置。Based on a high dose rate afterloading radiotherapy, the γ radiation level at inner entrance of the maze and the first transition in inner entrance of the maze as well as the outer entrance of the maze were calculated, and the influence of source＇ s location to the distribution of radiation level in the maze was analyzed through a monte-carlo code, whose reliability was tested by comparing with the results measured on-site. Results show that the radiation level in the maze strongly depends on the location of radioactive source in the treat room, and reach to a relatively lower level when the source locates at the east of treat room and close to the maze wall which can be recommended as an optimized location for source when executing the therapy.

关 键 词：高剂量率(HDR)后装放疗 MC程序 最优化 

分 类 号：R739.63[医药卫生—肿瘤]