A hierarchical algorithm for fast backprojection in helical cone-beam tomography
A hierarchical algorithm for fast backprojection in helical cone-beam tomography
复制标题
螺旋锥形束断层扫描中快速反投影的分层算法
DOI:
10.1109/isbi.2004.1398814
复制
发表时间:
2004
期刊:
影响因子:
--
通讯作者:
Y. Bresler
中科院分区:
文献类型:
--
作者:
J. Brokish;Y. Bresler
Existing algorithms for exact helical cone beam (HCB) tomographic reconstruction involve a 3-D backprojection step, which dominates the computational cost of the algorithm. We present a fast hierarchical 3-D backprojection algorithm, generalizing fast 2-D parallel beam and fan beam algorithms, which reduces the complexity of this step from O(N/sup 4/) to O(N/sup 3/log N), greatly accelerating the reconstruction process.