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Proceedings Paper

A geometric calibration method for cone beam CT system
Author(s): Qian Xiang; Jue Wang; Yufang Cai
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Paper Abstract

FDK algorithm widely used in cone beam CT image reconstruction has strict requirements on the geometric alignment of cone beam CT system. In terms of the cone beam CT system, especially the micro-CT system, the actual installation accuracy is difficult to meet the requirements of micro level positioning, it inevitably leads to image distortion. To solve this kind of problem, this paper proposes a geometric calibration method based on the square-line phantom. Firstly, we acquire square-line phantom projection in a fixed direction under different voltages, frame frequency and exposure time , and analytically determine the calibration geometry of the cone beam system. Finally reconstruct image using modified FDK algorithm, which has well calibrated the geometric errors of cone beam CT system. The experiments demonstrate that the proposed method has good noise immunity, and the positioning accuracy can meet the needs of practical application.

Paper Details

Date Published: 29 August 2016
PDF: 6 pages
Proc. SPIE 10033, Eighth International Conference on Digital Image Processing (ICDIP 2016), 100333G (29 August 2016); doi: 10.1117/12.2244579
Show Author Affiliations
Qian Xiang, Chongqing Univ. (China)
Jue Wang, Chongqing Univ. (China)
Yufang Cai, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 10033:
Eighth International Conference on Digital Image Processing (ICDIP 2016)
Charles M. Falco; Xudong Jiang, Editor(s)

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