document: Feldkamp-type image reconstruction from equiangular data The cone-beam approach for image reconstruction attracts increasing attention in various applications , especially medical imaging . Previously , the traditional practical cone-beam reconstruction method , the Feldkamp algorithm , was generalized into the case of spiral/helical scanning loci with equispatial cone-beam projection data . In this paper , we formulated the generalized Feldkamp algorithm in the case of equiangular cone-beam projection data , and performed numerical simulation to evaluate the image quality . Because medical multi-slice/cone-beam CT scanners typically use equiangular projection data , our new formula may be useful in this area as a framework for further refinement and a benchmark for comparison
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