摘要
针对离散体素模型仿真投影数据计算,提出了一种快速并行计算方法。首先从射线的对称性分析了投影数据的并行计算,然后通过Siddon算法来进行射线与体素的求交;结合SIMD技术实现了离散体素模型投影数据的快速并行计算。实验结果表明,在保持投影数据精度的同时,较之Siddon方法能够取得约1.9倍的加速比。
To calculate the simulation projection of discrete voxel model, a fast parallel calculation method is proposed. Firstly, the parallel calculation of projection data is analyzed from the symmetry of ray, Then the inter- section of ray and voxels are calculated by Siddon algorithm, and the SIMD technology is incorporated into the cal- culation, thus the parallel calculation of projection data is realized. Experimental results show that the proposed method is very effective and can be got a speedup about 1.9 times compared with Siddon algorithm without any loss of proiection data precision.
出处
《科学技术与工程》
北大核心
2013年第14期4057-4060,4065,共5页
Science Technology and Engineering
关键词
锥束CT
仿真投影
Siddon算法
SIMD
cone-beam CT simulation projection siddon algorithm single instruction multiple data
