Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (13): 2412-2415.doi: 10.3969/j.issn.1673-8225.2011.13.031

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A new method for quickly correcting ring artifacts in CT image

Lai Sheng-sheng, Peng Sheng-hua, Yu Xiao-e   

  1. School of Biomedical Engineering, Southern Medical University, Guangzhou  510515, Guangdong Province, China
  • Received:2010-12-17 Revised:2011-02-22 Online:2011-03-26 Published:2013-10-23
  • Contact: Yu Xiao-e, Associate professor, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, Guangdong Province, China yxe@fimmu.com
  • About author:Lai Sheng-sheng★, Studying for master’s degree, Lecturer, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, Guangdong Province, China laiss@gdyzy.edu.cn

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Abstract:

BACKGROUND: Ring artifacts, seriously affect the CT image quality, create difficulties to post-processing of the images, and easily lead to wrong diagnosis. At present, the removal of ring artifacts is essential.
OBJECTIVE: A new image correction method based on polar coordinate transformation is proposed to remove ring artifacts in CT image and to improve the precisions of post processing and quantitative analysis, as well as facilitate the diagnosis.
METHODS: Firstly, the CT images with ring artifacts were processed by linear transformation, converting the gray images into floating-point types of images. Secondly, the ring artifacts in the Cartesian coordinate were transformed into the vertical line artifacts in the polar coordinate. Thirdly, designing multidimensional filters, calculated the mean and variance of each pixel after filtering, compared with the threshold value to determine the scope of artifacts. Finally, correcting the range of artifacts, and converting into gray images by coordinate transformation.
RESULTS AND CONCLUSION: Designing program by Matlab 7.0, the experiment indicates that this method can correct ring artifacts in CT images quickly and effectively, and it is a image post-processing correction methods.

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