基于图形处理器的射线追踪数字重建影像方法

摘要

为提高肿瘤放射治疗计划系统中数字重建影像部分的计算效率,采用基于图形处理器的并行计算技术,对数字重建影像过程中最耗费计算机时的两部分,即由计算机断层扫描获取射野坐标系中的模体密度分布和射线追踪生成数字重建影像图像,实现了加速计算.在常用的个人计算机上,它们分别能够达到14～50和20～90倍的加速,对于实施实时治疗计划有重要实用价值.%To improve the reconstruction of digitally reconstructed radiography based on ray-tracing algorithm, graphics processing unit implementation was proposed. The most computer demanding phases in generating a DRR are the interpolation calculations of voxel attenuation coefficients from the computed tomography data and the ray-tracing calculations of the ray attenuations. By porting these two phases from CPU to GPU, the speedups of 14-50 times or 20-90 times can be achieved respectively on GPUs that are commonly used in PCs. The result is encouraging and demonstrating for developing real-time treatment planning.