Browse > Article
http://dx.doi.org/10.9718/JBER.2009.30.6.476

A Ring Artifact Correction Method for a Flat-panel Detector Based Micro-CT System  

Kim, Gyu-Won (Dept. of Biomedical Engineering, Kyung Hee University)
Lee, Soo-Yeol (Dept. of Biomedical Engineering, Kyung Hee University)
Cho, Min-Hyoung (Dept. of Biomedical Engineering, Kyung Hee University)
Publication Information
Journal of Biomedical Engineering Research / v.30, no.6, 2009 , pp. 476-481 More about this Journal
Abstract
The most troublesome artifacts in micro computed tomography (micro-CT) are ring artifacts. The ring artifacts are caused by non-uniform sensitivity and defective pixels of the x-ray detector. These ring artifacts seriously degrade the quality of CT images. In flat-panel detector based micro-CT systems, the ring artifacts are hardly removed by conventional correction methods of digital radiography, because very small difference of detector pixel signals may make severe ring artifacts. This paper presents a novel method to remove ring artifacts in flat-panel detector based micro-CT systems. First, the bad lines of a sinogram which are caused by defective pixels of the detector are identified, and then, they are corrected using a cubic spline interpolation technique. Finally, a ring artifacts free image is reconstructed from the corrected projections. We applied the method to various kinds of objects and found that the image qualities were much improved.
Keywords
micro-CT; ring artifacts; flat-panel detector; defective pixels; sinogram;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Myung H. Cho, I.K. Chun, S.C. Lee, M.H. Cho, and S.Y. Lee, "Trabecular thickness measurement in cancellous bones: postmortem rat studies with the zoom-in micro-tomography technique," Physiological Measurement, 26, pp.1-10, 2005   DOI   ScienceOn
2 S.C. Lee, H.K. Kim, I.K. Chun, Myung H. Cho, M.H. Cho, and S.Y. Lee, "Development and characterization of a flat-panel detector based microtomography system," Key Engineering Material, 270, pp.245-251, 2004   DOI
3 J. Sijbers, and, A. Postnov, "Reduction of ring artifacts in high resolution micro-CT reconstructions," J. Phys. Med. Biol., vol. 49, no. 14, pp.247-253, 2004   DOI   ScienceOn
4 X. Tang, R. Ning, R. Yu and D. Conover, "Cone beam volume CT image artifacts caused by defective cells in x-ray flat panel imagers and the artifact removal using a wavelet-analysis-based algorithm," J. Med. Phys., vol. 28, no. 5, pp.812-825, 2001   DOI   ScienceOn
5 H.K. Kim, S.C. Lee, I.K. Chun, Myung H. Cho, M.H. Cho, S.Y. Lee, and G.S. Cho, "Performance evaluation of a flat-panel detector and a microtomography system for small animal imaging," IEEE Nucl. Sci., vol. 52, no. 1, pp.193-198, 2005   DOI   ScienceOn
6 L.A. Feldkamp, L.C. Davis and J.W. Kress, "Practical cone-beam algorithm," J. Opt. Soc. Am. A, vol. 1, no. 6, pp.612-619, 1984   DOI
7 A. Barbier, C. Martel, M.C. De Vernejoulm F. Tirode, M. Nys, G. Mocaer, C. Morieux, H. Murakami and F. Lacheretz, "The visualization and evaluation of bone architecture in the rat using three-dimensional X-ray microcomputed tomography," J. Bone and Min. Research, vol. 17, pp.37-44, 1999   DOI   ScienceOn
8 D.A. Jaffray and J.H. Siewerdsen, "Cone-beam computed tomography with a flat-panel imager: Initial performance characterization," Med. Phys., vol. 27, no. 6, pp.1311-1323, 2000   DOI   ScienceOn
9 J.J. Park, S.Y. Lee and M.H. Cho, "Development of high resolution micro-CT system for in vivo small animal imaging," Journal of Biomedical Engineering Research, vol. 28, no. 1, pp.95-101, 2007   과학기술학회마을   ScienceOn
10 S.C. Lee, H.K. Kim, I.K. Chun, Myung H. Cho, S.Y. Lee, and M.H. Cho, "A flat-panel detector-based micro-CT system: Performance evaluation for small-animal imaging," Phys. Med. Biol., vol. 48, pp.4173-4185, 2003   DOI   ScienceOn
11 I.K. Chun, M.H. Cho, J.H. Park and S.Y. Lee, "In vivo trabecular thickness measurement in cancellous bones: longitudinal rat imaging studies," Physiological Measurement, 27, pp.695-702, 2006   DOI   ScienceOn