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Proceedings Paper

An interaction based CT reconstruction algorithm for blocked projection data in a dynamic ICT system
Author(s): Ming Chang; Yongshun Xiao; Zhiqiang Chen; Xin Jin
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Paper Abstract

In order to detect deformations of parts during the operating test, a novel dynamic industry computed tomography (ICT) system taking advantage of the rotation of specimens itself was purposed by us. However the stationary parts such as the shell around the turbine tips, which are hardly removed due to some industrial reasons, contaminate the projection data, so the blocks are not easily corrected from the projections as what we did in the traditional detector correction procedure. In this work, an interaction based CT reconstruction algorithm is purposed to deal the problem. First of all, we directly reconstruct the image with the contaminated projection data and an interactive match between the reconstructed image and the prior image is performed according to some obvious features. Then a forward-projection of the matched prior image with the practical geometric parameters is made. The block components in the projection data are estimated by calculating the average difference between the forward projections and the real projections of certain detectors. Finally, a new image can be reconstructed using the corrected data. Furthermore, the efficiency of the purposed algorithm is proved by both numerical simulation and practical experiments.

Paper Details

Date Published: 17 October 2012
PDF: 6 pages
Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85060Z (17 October 2012); doi: 10.1117/12.927362
Show Author Affiliations
Ming Chang, Tsinghua Univ. (China)
Yongshun Xiao, Tsinghua Univ. (China)
Zhiqiang Chen, Tsinghua Univ. (China)
Xin Jin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 8506:
Developments in X-Ray Tomography VIII
Stuart R. Stock, Editor(s)

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