›› 2015, Vol. 24 ›› Issue (2): 28703-028703.doi: 10.1088/1674-1056/24/2/028703
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
陈建林, 李磊, 王林元, 蔡爱龙, 席晓琦, 张瀚铭, 李建新, 闫镔
Chen Jian-Lin (陈建林), Li Lei (李磊), Wang Lin-Yuan (王林元), Cai Ai-Long (蔡爱龙), Xi Xiao-Qi (席晓琦), Zhang Han-Ming (张瀚铭), Li Jian-Xin (李建新), Yan Bin (闫镔)
摘要: The projection matrix model is used to describe the physical relationship between reconstructed object and projection. Such a model has a strong influence on projection and backprojection, two vital operations in iterative computed tomographic reconstruction. The distance-driven model (DDM) is a state-of-the-art technology that simulates forward and back projections. This model has a low computational complexity and a relatively high spatial resolution; however, it includes only a few methods in a parallel operation with a matched model scheme. This study introduces a fast and parallelizable algorithm to improve the traditional DDM for computing the parallel projection and backprojection operations. Our proposed model has been implemented on a GPU (graphic processing unit) platform and has achieved satisfactory computational efficiency with no approximation. The runtime for the projection and backprojection operations with our model is approximately 4.5 s and 10.5 s per loop, respectively, with an image size of 256×256×256 and 360 projections with a size of 512×512. We compare several general algorithms that have been proposed for maximizing GPU efficiency by using the unmatched projection/backprojection models in a parallel computation. The imaging resolution is not sacrificed and remains accurate during computed tomographic reconstruction.
中图分类号: (X-ray imaging)