计算机科学 ›› 2015, Vol. 42 ›› Issue (2): 301-305.doi: 10.11896/j.issn.1002-137X.2015.02.064
杜晓刚,党建武,王阳萍
DU Xiao-gang, DANG Jian-wu and WANG Yang-ping
摘要： 鉴于数字重建影像生成过程具有良好的并行性,实现了一种基于CUDA并行计算的数字重建影像生成算法。该算法首先在CPU端使用八叉树结构来剔除体数据中的空体素并将其载入GPU；然后在GPU中根据光线和线程的对应关系,设计光线内核函数来模拟一束X线穿透人体组织的衰减过程；最后在GPU中由多线程并行执行内核函数来完成DRR图像生成过程。实验结果表明,该方法在保证DRR生成质量的前提下能有效利用GPU的并行计算能力,提高DRR图像的生成效率,满足图像引导放疗中对DRR生成过程的实时性要求。
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