›› 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

Fast parallel algorithm for three-dimensional distance-driven model in iterative computed tomography reconstruction

陈建林, 李磊, 王林元, 蔡爱龙, 席晓琦, 张瀚铭, 李建新, 闫镔   

  1. National Digital Switching System Engineering & Technological R & D Center, Zhengzhou 450002, China
  • 收稿日期:2014-06-25 修回日期:2014-09-11 出版日期:2015-02-05 发布日期:2015-02-05
  • 基金资助:
    Projected supported by the National High Technology Research and Development Program of China (Grant No. 2012AA011603) and the National Natural Science Foundation of China (Grant No. 61372172).

Fast parallel algorithm for three-dimensional distance-driven model in iterative computed tomography reconstruction

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)   

  1. National Digital Switching System Engineering & Technological R & D Center, Zhengzhou 450002, China
  • Received:2014-06-25 Revised:2014-09-11 Online:2015-02-05 Published:2015-02-05
  • Contact: Yan Bin E-mail:tom.yan@gmail.com
  • Supported by:
    Projected supported by the National High Technology Research and Development Program of China (Grant No. 2012AA011603) and the National Natural Science Foundation of China (Grant No. 61372172).

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.

关键词: computed tomography, iterative reconstruction, parallelizable algorithm, distance-driven model

Abstract: 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.

Key words: computed tomography, iterative reconstruction, parallelizable algorithm, distance-driven model

中图分类号:  (X-ray imaging)

  • 87.59.-e
07.85.-m (X- and γ-ray instruments) 87.57.Q- (Computed tomography)