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2004
IEEE

A Hierarchical Algorithm for Fast Backprojection in Helical Cone-Beam Tomography

13 years 18 days ago
A Hierarchical Algorithm for Fast Backprojection in Helical Cone-Beam Tomography
Existing algorithms for exact helical cone beam (HCB) tomographic reconstruction involve a 3-D backprojection step, which dominates the 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(N4 ) to O(N3 log N), greatly accelerating the reconstruction process.
Jeffrey Brokish, Yoram Bresler
Added 20 Nov 2009
Updated 20 Nov 2009
Type Conference
Year 2004
Where ISBI
Authors Jeffrey Brokish, Yoram Bresler
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