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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 11 — Jun. 2, 2014
  • pp: 13380–13392

Ring artifact correction using detector line-ratios in computed tomography

Younguk Kim, Jongduk Baek, and Dosik Hwang  »View Author Affiliations

Optics Express, Vol. 22, Issue 11, pp. 13380-13392 (2014)

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Ring artifacts in computed tomography (CT) images degrade image quality and obscure the true shapes of objects. While several correction methods have been developed, their performances are often task-dependent and not generally applicable. Here, we propose a novel method to reduce ring artifacts by calculating the ratio of adjacent detector elements in the projection data, termed the line-ratio. Our method estimates the sensitivity of each detector element and equalizes them in sinogram space. As a result, the stripe pattern can be effectively removed from sinogram data, thereby also removing ring artifacts from the reconstructed CT image. Numerical simulations were performed to evaluate and compare the performance of our method with that of conventional methods. We also tested our method experimentally and demonstrated that our method has superior performance to other methods.

© 2014 Optical Society of America

OCIS Codes
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6960) Medical optics and biotechnology : Tomography

ToC Category:
Image Processing

Original Manuscript: March 25, 2014
Revised Manuscript: May 19, 2014
Manuscript Accepted: May 20, 2014
Published: May 27, 2014

Virtual Issues
Vol. 9, Iss. 8 Virtual Journal for Biomedical Optics

Younguk Kim, Jongduk Baek, and Dosik Hwang, "Ring artifact correction using detector line-ratios in computed tomography," Opt. Express 22, 13380-13392 (2014)

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