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KMID : 1151820150090060403
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Journal of the Korean Society of Radiology
2015 Volume.9 No. 6 p.403 ~ p.408
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Removal of Ring Artifact in Computed Tomography
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Chon Kwon-Su
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Abstract
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Hard X-ray has been widely used in medical and industrial fields because it can be applied to observe the inside of a sample. Computed tomography provides sectional images of the sample through the reconstruction of the projection images. The quality of sectional images strongly depends on that of projection images. Ring artifact appeared on the seconal image can be made by the abnormal pixels of the detector used. In this study, we examine the ring artifact ratio in the circle phantom as a function of detection error of the detector used in computed tomography. The ring artifact increased with the increment of detection error under parallel and fan beam geometries and strongly increased near the center of rotation. The corrections, dead pixel and flat field corrections, for the images taken with the detector are required before the image reconstruction process to reduce the ring artifact in the computed tomography.
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KEYWORD
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Hard X-ray, Computed Tomography, Projection Image, Ring Artifact
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