26 September 2017 Removing ring artefacts from synchrotron radiation-based hard x-ray tomography data
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In hard X-ray microtomography, ring artefacts regularly originate from incorrectly functioning pixel elements on the detector or from particles and scratches on the scintillator. We show that due to the high sensitivity of contemporary beamline setups further causes inducing inhomogeneities in the impinging wavefronts have to be considered. We propose in this study a method to correct the thereby induced failure of simple flatfield approaches. The main steps of the pipeline are (i) registration of the reference images with the radiographs (projections), (ii) integration of the flat-field corrected projection over the acquisition angle, (iii) high-pass filtering of the integrated projection, (iv) subtraction of filtered data from the flat-field corrected projections. The performance of the protocol is tested on data sets acquired at the beamline ID19 at ESRF using single distance phase tomography.
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Peter Thalmann, Christos Bikis, Georg Schulz, Pierre Paleo, Alessandro Mirone, Alexander Rack, Stefan Siegrist, Emre Cörek, Jörg Huwyler, Bert Müller, "Removing ring artefacts from synchrotron radiation-based hard x-ray tomography data", Proc. SPIE 10391, Developments in X-Ray Tomography XI, 1039114 (26 September 2017); doi: 10.1117/12.2274236; https://doi.org/10.1117/12.2274236


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