Investigation on the influence of image quality in X-ray CT metrology

Pavel Müller, Jochen Hiller, Angela Cantatore, Markus Bartscher, Leonardo De Chiffre

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    Abstract

    This paper presents a method for evaluating measuring errors in a CT system using information from quality of reconstruction images. In particular, spatial resolution and pixel noise are considered in this work. Both factors can be theoretically described using formulas, and can be expressed as a combination of scanning setting parameters. A 32 full factorial design of experiment (DOE) was carried out to determine the influence of the two factors on dimensional measurements. For quantification of the influence, an evaluation parameter sphere distance error was selected. Results show that the spatial resolution is a dominant factor. Analysis of the reconstruction images is carried out, showing image artifacts occurring on the spheres visible under large opening angle, which are usually more significant for CT scans at high magnification. Theoretical formulation of pixel noise was validated through the experimentation.
    Original languageEnglish
    Publication date2012
    Number of pages10
    Publication statusPublished - 2012
    Event4th International Conference on Industrial Computed Tomography - University of Applied Sciences Upper Austria, Wels, Austria
    Duration: 19 Sep 201221 Sep 2012
    Conference number: 4

    Conference

    Conference4th International Conference on Industrial Computed Tomography
    Number4
    LocationUniversity of Applied Sciences Upper Austria
    Country/TerritoryAustria
    CityWels
    Period19/09/201221/09/2012

    Keywords

    • Computed tomography
    • Image quality
    • Pixel noise
    • Spatial resolution
    • Dimensional CT measurement

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