摘要
γ比较方法作为放射治疗剂量学验证中的一种手段,现在已经在科研和临床的剂量分布比较中得到广泛应用。但是,在比较三维剂量分布时,γ因子的计算量大,需要花费大量的时间。本文采用一种预先排序技术和基于图形处理器(GPU)的并行计算技术结合,实现了γ因子的快速计算。通过7对剂量分布的测试,基于GPU的γ因子的计算速度提高了几十倍,而且与CPU相比保持了相同的计算精度。实验结果表明,利用GPU的并行计算对γ比较方法进行加速是切实有效的。
As a method of dosimetric verification in radiotherapy, γ index has been widely used for evaluating dose distribution in research and clinical cases. However, for three-dimensional dose distributions, γ index calculation is very time consuming for the computers. In this paper, based on a pre-sorting technique, we implement a parallel computing algorithm of γ index on graphic processing unit （GPU）. Dose comparisons are performed for seven cases to test our new implementation. It was shown that the GPU-based γ index calculations achieved a speedup of tenfolds in comparison with corresponding CPU implementation without losing accuracy. The result showed that utilizing GPU parallel computing to speed up γ index calculations could be reliable and efficient in the implementation.
出处
《生物医学工程学杂志》
EI
CAS
CSCD
北大核心
2012年第3期550-554,共5页
Journal of Biomedical Engineering
基金
国家自然科学基金资助项目(10475059)
关键词
剂量比较
γ因子
图形处理器
Dose comparison
γ index
Graphic processing unit （GPU）
