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KMID : 1151820180120010065
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Journal of the Korean Society of Radiology
2018 Volume.12 No. 1 p.65 ~ p.70
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Investigation of Ring Artifact Using Algebraic Reconstruction Technique
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Chon Kwon-Su
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Abstract
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Computed tomography system is widely used on various fields because section image of an object can be acquired. During several step to obtain section image, artifacts by many error factors can be added on the image. Ring artifact induced by the CT system is examined in this study. A test phantom of 512 × 512 size was constructed numerically, and the ring artifact was investigated by the algebraic reconstruction technique. The computer program was realized using Visual C++ under the fan beam geometry with projections of 720 and detector pixel of 1,280. The generation of ring artifact was verified by applying different detection efficiency on detector pixels. The ring intensity became large as increasing the ring value, and the ring artifacts were strongly emphasized near the center of the reconstructed image. The ring artifact may be eliminated by tracking the position of ring artifact on the reconstructed image and by calibrating the detector pixel.
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KEYWORD
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Computed Tomography, Ring Artifact, Algebraic Reconstruction Technique, Detector Pixel
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