An interaction based CT reconstruction algorithm for blocked projection data in a dynamic ICT system

Ming Chang; Yongshun Xiao; Zhiqiang Chen; Xin Jin

doi:10.1117/12.927362

17 October 2012 An interaction based CT reconstruction algorithm for blocked projection data in a dynamic ICT system

Ming Chang, Yongshun Xiao, Zhiqiang Chen, Xin Jin

Proceedings Volume 8506, Developments in X-Ray Tomography VIII; 85060Z (2012) https://doi.org/10.1117/12.927362
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

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.

Citation Download Citation

Ming Chang, Yongshun Xiao, Zhiqiang Chen, and Xin Jin "An interaction based CT reconstruction algorithm for blocked projection data in a dynamic ICT system", Proc. SPIE 8506, Developments in X-Ray Tomography VIII, 85060Z (17 October 2012); https://doi.org/10.1117/12.927362

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