Joseph Lifton and Tong Liu, "Ring artefact reduction via multi-point piecewise linear flat field correction for X-ray computed tomography," Opt. Express 27, 3217-3228 (2019)
Abstract:
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 a minimum of seven open field images should be used for flat field correction.
License type:
PublisherCopyrights
Funding Info:
This research is supported by core funding from the Singapore Institute of Manufacturing Technology.
Description:
The full paper is available for free download at the publisher's URL: https://doi.org/10.1364/OE.27.003217