Ring artifacts correction based on the projection-field in neutron CT* *Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFA0401502 and 2017YFB0701903), the National Natural Science Foundation of China (Grant Nos. U1832219 and 12005166), the Youth Innovation Promotion Association, the Chinese Academy of Sciences (CAS) (Grant No. 2017023), the Guangdong Natural Science Foundation, China (Grant

Abstract

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.