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Article type: Research Article
Authors: Li, Liang | Chen, Zhiqiang | Zhang, Li | Kang, Kejun
Affiliations: Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
Note: [] Corresponding author: Liang Li, Tel.: +86 10 62780909; E-mail: liliang02@mails.tsinghua.edu.cn
Abstract: In this paper, variable pitch helical cone-beam CT is studied. We prove a sufficient condition for the existence of PI-lines inside this variable pitch helix. Under this condition, we propose a new scanning configuration, called a spring scan, which can be used to scan a cylindrical object support. Based on Zou and Pan's BPF algorithm, we develop an exact BPF-type reconstruction algorithm for helical cone-beam CT in which the pitch of the helix varies with rotation angles. The algorithm includes four steps and can be used in region-of-interest (ROI) reconstruction by the PI-line determination step without a rebinning procedure as other BPF algorithms. Moreover, the algorithm can exactly reconstruct the object image only using the projection data within the Tam-Danielsson window, while Katsevich's algorithm requires more data than it. Furthermore, we test the proposed algorithm using the 3D Shepp-Logan phantom by a spring scan. The numerical results are described to support the correctness of the algorithm.
Keywords: Backprojection-filtration, cone-beam, image reconstruction, spring scan, PI-line
Journal: Journal of X-Ray Science and Technology, vol. 14, no. 2, pp. 109-118, 2006
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