대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제30권6호
  • /
  • Pages.476-481
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  • 2009
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  • 1229-0807(pISSN)
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  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
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평판 디텍터 기반 마이크로 CT시스템을 위한 Ring Artifact 보정 방법

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

  • 김규원 (경희대학교 동서의료공학과) ;
  • 이수열 (경희대학교 동서의료공학과) ;
  • 조민형 (경희대학교 동서의료공학과)
  • 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)
  • 발행 : 2009.12.31
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초록

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.

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참고문헌

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