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Fast hierarchical backprojection for helical cone-beam tomography

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2 Author(s)
Y. Bresler ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL, USA ; J. Brokish

Existing algorithms for exact helical cone beam (HCB) tomographic reconstruction are computationally infeasible for clinical applications. Their computational cost is dominated by 3-D backprojection, which is generally an O(N4) operation. We present a fast hierarchical 3-D backprojection algorithm, generalizing fast 2-D parallel beam and fan beam algorithms, which reduces the overall complexity of this step to O(N3 log N), greatly accelerating the reconstruction.

Published in:

Image Processing, 2003. ICIP 2003. Proceedings. 2003 International Conference on  (Volume:2 )

Date of Conference:

14-17 Sept. 2003