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�������պ����ѧѧ�� 2007, Vol. 33 Issue (11) :1378-1382    DOI:
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Ring artifact correction for industrial CT images
Li Junjiang, Hu Shaoxing, Li Baolei, Yang Min*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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Abstract�� Ring artifacts in computed tomography (CT) images are introduced by imperfect pixel channel in a detector. Ring artifacts degrade the CT image, hamper post processing and prohibit quantitative analysis. A set of algorithms that enable virtually complete ring artifact correction were proposed. Correction for pixel channel response nonuniformity was that offset and gain correction were done to compensate for response nonuniformity in the detector. Correction for projection sinogram data was that the vertical line artifacts in the sonogram were removed by a computationally efficient filter. Correction for already-reconstructed images was that the ring artifacts in the Cartesian coordinate were transformed into the vertical line artifacts in the polar coordinate and removed as sonogram correction. The procedures were created to deal with data acquired from an YXLON XRS232 9″ image intensifier. Ring artifacts were reduced significantly with minimal to negligible contamination of the underlying data.
Keywords�� image intensifier   computed tomography   ring artifact   sinogram   response nonuniformity     
Received 2006-11-17;


About author: ���(1979-),��,ɽ��������,��ʿ��,junjiang_li@163.com.
���,������,���,����.CTͼ��״αӰУ������[J]  �������պ����ѧѧ��, 2007,V33(11): 1378-1382
Li Junjiang, Hu Shaoxing, Li Baolei, Yang Min.Ring artifact correction for industrial CT images[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(11): 1378-1382
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2007/V33/I11/1378
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