Ring artifacts correction based on the projection-field in neutron CT

• Published in: Chinese physics B Vol. 30; no. 5; pp. 50601 - 304
• Main Authors: Wang, Sheng-Xiang, Chen, Jie, Tan, Zhi-Jian, Deng, Si-Hao, Wu, Yao-Da, Lu, Huai-Le, Li, Shou-Ding, Chen, Wei-Chang, He, Lun-Hua
• Format: Journal Article
• Language: English
• Published: Institute of High Energy Physics,Chinese Academy of Sciences (CAS),Beijing 100049,China%Key Laboratory of Shale Gas and Geoengineering,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 01.05.2021; Spallation Neutron Source Science Center,Dongguan 523803,China; College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China%Spallation Neutron Source Science Center,Dongguan 523803,China; Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China; Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
• Subjects: projection field; neutron CT; ring artifacts correction
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/abd743

Ring artifacts will happen mostly when the detector has inconsistent response among the detector channels, and the characteristic produced rings centered in the iso-center in the reconstructed slices inevitably affect the recognition and analysis of the corresponding sample structures in neutron computed tomography (CT). In this work, a ring correction method based on the projection-field (RCP) is proposed, it is a pre-processing method and provides the corrected projection data directly, which is also conducive to efficient data storage and other algorithmic researches. Simulation and physical experiments are performed for verifying the effect of the method, and one of the correction methods based on the image-field is used for comparison. The results demonstrate that the RCP can correct the ring artifacts well without reducing the image resolution or over-correction.