Ring artefact reduction via multi-point piecewise linear flat field correction for X-ray computed tomography
Ring artefact reduction via multi-point piecewise linear flat field correction for X-ray computed tomography
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.
3217-3228
Lifton, Joseph
9be501ec-2742-4ab6-8a5a-996c5b7c23ae
Liu, Tong
17f1a70b-449d-4078-af64-957a5b374698
4 February 2019
Lifton, Joseph
9be501ec-2742-4ab6-8a5a-996c5b7c23ae
Liu, Tong
17f1a70b-449d-4078-af64-957a5b374698
Lifton, Joseph and Liu, Tong
(2019)
Ring artefact reduction via multi-point piecewise linear flat field correction for X-ray computed tomography.
Optics Express, 27 (3), .
(doi:10.1364/OE.27.003217).
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 that a minimum of seven open field images should be used for flat field correction.
Text
oe-27-3-3217
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Accepted/In Press date: 1 January 2019
e-pub ahead of print date: 30 January 2019
Published date: 4 February 2019
Identifiers
Local EPrints ID: 507721
URI: http://eprints.soton.ac.uk/id/eprint/507721
ISSN: 1094-4087
PURE UUID: 1e4bf57e-80cd-4aec-811f-25189222fda0
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Date deposited: 19 Dec 2025 18:13
Last modified: 20 Dec 2025 03:48
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Author:
Joseph Lifton
Author:
Tong Liu
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