Affiliations: Department of Elec. and Comp. Engineering, Beijing
Union University, Beijing 100101, China. E-mail:
wbtl@publica.bj.cninfo.net | University of Oklahoma, 202 west Boyd, Room 219,
Norman, OK 73019, USA. E-mail: liu@ou.edu | Department of Math. & Comp. Science, University
of Missouri at St. Louis, St. Louis, MO 63121, USA. E-mail:
zhao@arch.umsl.edu | Department of Radiology, University of Iowa, Iowa
City, Iowa 52242, USA. E-mail: ge-wang@uiowa.edu
Abstract: The cone-beam approach for image reconstruction attracts an
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.
Keywords: computed tomography (CT), cone-beam geometry, Feldkamp-type reconstruction, medical imaging
