Fast hierarchical backprojection for helical cone-beam tomography

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 Ç´Æ µ 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 Ç´Æ¿ ÐÓ Æµ, greatly accelerating the reconstruction.

• Type: Conference
• Year: 2003
• Where: ICIP
• Authors: Yoram Bresler, Jeffrey Brokish
• Keywords: 3-D Backprojection, Helical Cone Beam, Hierarchical 3-D Backprojection, ICIP 2003, Image Processing