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Analytical formula for two-dimensional ring artefact suppression

DOI: 10.1107/S160057751601479X DOI Help

Authors: Valeriy Titarenko (University of Manchester/UMIST)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Synchrotron Radiation , VOL 23 , PAGES 1447 - 1461

State: Published (Approved)
Published: November 2016

Abstract: Ring artefacts are the most disturbing artefacts when reconstructed volumes are segmented. A lot of effort has already been put into better X-ray optics, scintillators and detectors in order to minimize the appearance of these artefacts. However, additional processing is often required after standard flat-field correction. Several methods exist to suppress artefacts. One group of methods is based on minimization of the Tikhonov functional. An analytical formula for processing of a single sinogram was developed. In this paper a similar approach is used and a formula for processing two-dimensional projections is found. Thus suppression of ring artefacts is organized as a two-dimensional convolution of `averaged' projections with a given filter. Several approaches are discussed in order to find elements of the filter in a faster and accurate way. Examples of experimental datasets processed by the proposed method are considered.

Subject Areas: Technique Development


Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: Synchrotron Radiation Source