Open AccessRing artefact reduction via multi-point piecewise linear flat field correction for X-ray computed tomography
Author(s) -
Joseph Lifton,
Tong Liu
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.003217
Subject(s) - optics , tomography , detector , flat panel detector , reduction (mathematics) , point (geometry) , field (mathematics) , resolution (logic) , noise (video) , physics , geometry , computer science , mathematics , computer vision , artificial intelligence , image (mathematics) , pure mathematics
X-ray computed tomography (XCT) is a well-established method for measuring and inspecting an object's internal structure in a non-destructive manner. Ring artefacts are unwanted high- or low-intensity rings that appear in CT images that influence CT-based measurements. The cause of the subtle ring artefacts found in high-resolution XCT data is found to be due to inadequate flat field detector correction. Therefore, in this work, the usual two-point flat field correction is replaced by a multi-point, piecewise linear flat field correction. The proposed method is shown to increase the signal-to-noise ratio of exemplary CT data by up to 12.1%. Based on the results presented, it is recommended that a minimum of seven open field images should be used for flat field correction.