Ring artifact suppression in X-ray computed tomography using a simple, pixel-wise response correction

Linda C.P. Croton, Gary Ruben, Kaye S. Morgan, David M. Paganin, Marcus J. Kitchen

Research output: Contribution to journalArticleResearchpeer-review

15 Citations (Scopus)


We present a pixel-specific, measurement-driven correction that effectively reduces errors in detector response that give rise to the ring artifacts commonly seen in X-ray computed tomography (CT) scans. This correction is easy to implement, suppresses CT artifacts significantly, and is effective enough for use with both absorption and phase contrast imaging. It can be used as a standalone correction or in conjunction with existing ring artifact removal algorithms to further improve image quality. We validate this method using two X-ray CT data sets acquired using monochromatic sources, showing post-correction signal-to-noise increases of up to 55%, and we define an image quality metric to use specifically for the assessment of ring artifact suppression.

Original languageEnglish
Pages (from-to)14231-14245
Number of pages15
JournalOptics Express
Issue number10
Publication statusPublished - 13 May 2019

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