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Num. Meth. Prog., 2014, Volume 15, Issue 4, Pages 726–731 (Mi vmp287)  

Subpixel smoothing by floating grids for ring artefact reduction in fan-beam tomography

V. V. Pickalov

Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk

Abstract: The distinctions between the artifacts of the tomographic data acquisition systems with parallel and fan-beam geometry are studied. A new method for suppressing such artifacts on the basis of subpixel smoothing by floating grids is proposed. A non-iterative algorithm based on the classical Shepp–Logan method of filtered back-projection with random shifts (within fractions of a pixel) of each detector element or each pixel of a tomogram is developed. According to the results of mathematical simulation using a variety of models, it is shown that the level of ring artifacts can be reduced by subpixel smoothing comparable to the existing methods of artifact suppression.

Keywords: inverse problems, gas flow tomography, numerical algorithms, fan-beam tomography, tomogram artifacts, subpixel smoothing, Shepp-Logan filter.

Full text: PDF file (265 kB)
UDC: 519.633.9
Received: 27.11.2014

Citation: V. V. Pickalov, “Subpixel smoothing by floating grids for ring artefact reduction in fan-beam tomography”, Num. Meth. Prog., 15:4 (2014), 726–731

Citation in format AMSBIB
\Bibitem{Pic14}
\by V.~V.~Pickalov
\paper Subpixel smoothing by floating grids for ring artefact reduction in fan-beam tomography
\jour Num. Meth. Prog.
\yr 2014
\vol 15
\issue 4
\pages 726--731
\mathnet{http://mi.mathnet.ru/vmp287}


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