放射治疗机最佳适形多叶组合光栅叶片形状设计  

Leaf shape design of multi-leaf collimator in radiotherapeutic machine for optimum conformation

作　　者：侯建华[1] 欧宗瑛[1] 宋卫卫[2] 

机构地区：[1]大连理工大学精密与特种加工教育部重点实验室,辽宁大连116024 [2]大连理工大学机械工程学院CAD&CG研究所,辽宁大连116024

出　　处：《大连理工大学学报》2007年第6期840-845,共6页Journal of Dalian University of Technology

基　　金：国家"863"计划资助项目(863-306-ZD13-03-6)

摘　　要：讨论了三维适形放射治疗中的多叶组合光栅叶片形状设计.根据放射治疗中剂量精确适形的要求,确定了多叶组合光栅叶片侧面的梯形聚焦形式和榫槽配合防漏射结构.使用遗传算法对叶片端面形状进行了优化设计,使端面产生的半影大小和一致性得以改善.针对几种典型的射野参数进行了设计计算,结果表明优化设计的端面形状在任何叶片位置所产生的半影接近于常数,设计的叶片形状可达到最佳剂量适形效果.The leaf shape therapy was dealt with. design of multi-leaf collimator used in 3-dimensional conformal radiation According to the requirements of precision conformal dose delivery in radiation therapy, the focused trapezoid cross-sectional shape of the flank leaf of multi-leaf collimator is introduced, and the tongue-groove structure, which is used to minimize interleaf transmission, is determined. Genetic algorithm is utilized to optimize the leaf end shape to improve the size and uniformity of leaf-end penumbra. For several typical field sizes, the optimization is carried out. The result shows that the leaf-end penumbra keeps nearly constant in any leaf position. Optimum dose conformation can be realized by these leaf shape designs.

关 键 词：放射治疗 适形 多叶组合光栅 半影 遗传算法 

分 类 号：R730.8[医药卫生—肿瘤]