Katsevich-type reconstruction for dual helical cone-beam CT

Article type: Research Article

Authors: Zeng, Li^; | Zou, Xiaobing^;

Affiliations: ICT Research Center, Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China, Chongqing University, Chongqing, China | College of Mathematics and Physics, Chongqing University, Chongqing, China | Department of Computer Science, College of Chongqing Education, Chongqing, China

Note: [] Corresponding author. E-mail: drlizeng@hotmail.com

Abstract: This paper is about inspecting large and long object using dual helical cone-beam computed tomography (CT) and Katsevich-type reconstruction algorithm. Conventional cone-beam helical industrial CT imaging is based on the assumption that the entire cross-section of an object is illuminated with x-rays at each view angle. The field of view is limited by the width of planar detector. As an alternative, this paper developed a dual-helical scanning. When scanning at each helix, part of cross-section is covered by x-ray at each view angle. During reconstruction, Katsevich-type algorithm is applied, which does not rebin projection data. The algorithm is approximate, as it applies Hilbert transform on truncated projection. The reconstruction result is better than extended FDK algorithm, especially for large helical pitch.

Keywords: Industrial CT, cone beam, dual helical scanning, Katsevich-type algorithm

DOI: 10.3233/XST-2010-0266

Journal: Journal of X-Ray Science and Technology, vol. 18, no. 4, pp. 353-367, 2010