摘要
在调强放射治疗中,为了保证剂量计算的精确度和避免不必要的时间耗费,采用微分卷积积分方法进行剂量计算时,选择一个合适的散射截止半径是非常重要的。在不考虑散射的情况下,利用模拟动力学最优化方法优化得到射野强度,并用微分卷积积分法分别对一个模拟例子和一个临床例子在不同散射截止半径下的剂量分布进行了计算,然后通过对剂量体积直方图的比较发现,散射截止半径的选取不同,对剂量计算结果有着较大的影响,并且在光子的能量为6 MV时,散射截止半径选取为3 cm是比较合理的。
In intensity-modulated radiotherapy, how to choose the radiation cut-off radius is very important to the precision and computational efficiency in convolution based dose calculation. By using the simulated dynamics algorithm, the intensity profile was optimized,and the Convolution Superposition model was used to calculate the dose distribution of one test sample and one clinic case by changing the radiation cut-off radii. By comparing the dose distribution using dose volume histogram ( DVH), it was found that the dose distribution depends on the scattering cut-off distance. When the photon energy is 6 MV, the radiation cut-off radius of 3.0 cm is a reasonable choice considering both the precision and computational efficiency.
出处
《四川大学学报(工程科学版)》
EI
CAS
CSCD
北大核心
2007年第2期156-159,共4页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(10275045)
四川大学青年科学基金资助项目(200572)
关键词
调强放射治疗
微分卷积积分法
散射截止半径
剂量计算
intensity-modulated radiotherapy(IMRT)
convolution superposition
radiation cut-off radius
dose calculation