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KMID : 1137820090300060476
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의공학회지
2009 Volume.30 No. 6 p.476 ~ p.781
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A Ring Artifact Correction Method for a Flat-panel Detector Based Micro-CT System
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Choi Gyu-Won
Lee Soo-Yeol
Cho Min-Hyoung
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Abstract
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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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KEYWORD
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micro-CT, ring artifacts, flat-panel detector, defective pixels, sinogram
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