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Sensors 2017, 17(2), 269; doi:10.3390/s17020269

A Ring Artifact Correction Method: Validation by Micro-CT Imaging with Flat-Panel Detectors and a 2D Photon-Counting Detector

Department of Biomedical Engineering, Kyung Hee University, Yongin, Gyeonggi 17104, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Caterina Ciminelli
Received: 3 October 2016 / Revised: 15 December 2016 / Accepted: 26 January 2017 / Published: 30 January 2017
(This article belongs to the Section Physical Sensors)
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Abstract

We introduce an efficient ring artifact correction method for a cone-beam computed tomography (CT). In the first step, we correct the defective pixels whose values are close to zero or saturated in the projection domain. In the second step, we compute the mean value at each detector element along the view angle in the sinogram to obtain the one-dimensional (1D) mean vector, and we then compute the 1D correction vector by taking inverse of the mean vector. We multiply the correction vector with the sinogram row by row over all view angles. In the third step, we apply a Gaussian filter on the difference image between the original CT image and the corrected CT image obtained in the previous step. The filtered difference image is added to the corrected CT image to compensate the possible contrast anomaly that may appear due to the contrast change in the sinogram after removing stripe artifacts. We applied the proposed method to the projection data acquired by two flat-panel detectors (FPDs) and a silicon-based photon-counting X-ray detector (PCXD). Micro-CT imaging experiments of phantoms and a small animal have shown that the proposed method can greatly reduce ring artifacts regardless of detector types. Despite the great reduction of ring artifacts, the proposed method does not compromise the original spatial resolution and contrast. View Full-Text
Keywords: ring artifact correction; flat-panel detector; photon-counting X-ray detector; correction vector; Gaussian filter ring artifact correction; flat-panel detector; photon-counting X-ray detector; correction vector; Gaussian filter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Eldib, M.E.; Hegazy, M.; Mun, Y.J.; Cho, M.H.; Cho, M.H.; Lee, S.Y. A Ring Artifact Correction Method: Validation by Micro-CT Imaging with Flat-Panel Detectors and a 2D Photon-Counting Detector. Sensors 2017, 17, 269.

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