
Proceedings Paper
Artifacts in X-ray dark-field measurementsFormat | Member Price | Non-Member Price |
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Paper Abstract
Grating-based X-ray phase-contrast imaging with a Talbot-Lau interferometer is a promising method which
might be able to increase soft tissue contrast and to gain additional information in comparison to attenuationbased
imaging. The method provides an attenuation image, a differential phase image and a dark-field image.
A conventional polychromatic X-ray tube can be used together with a Talbot-Lau interferometer consisting of
a source grating, a phase grating and an absorption grating. The dark-field image shows information about the
sub-pixel-size granularity of the measured object. This supplemental information is supposed to be suitable in
applications, such as mammography or nondestructive testing.
In this contribution we present results of measurements investigating the thickness-dependent behavior of
dark-field imaging. The measurements are performed with a wedge-shaped, granular object with our X-ray
phase-contrast imaging set-up and calculating the dark-field image. Measurements with this special phantom
show a resurgence of visibility contrast with increasing thickness of the object after passing a minimum. The
reason of this artifact is not completely clear up to now, but might be found in attenuation effects in the object
in combination with the polychromatic X-ray spectrum or in residual amplitudes in our fitting algorithm for low
visibilities and low intensities at large thicknesses. Understandig the thickness-dependent behavior of the X-ray
dark-field advances the understanding of the formation of the dark-field image.
Paper Details
Date Published: 19 March 2013
PDF: 6 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866855 (19 March 2013); doi: 10.1117/12.2008059
Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)
PDF: 6 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 866855 (19 March 2013); doi: 10.1117/12.2008059
Show Author Affiliations
Florian Horn, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Florian Bayer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Karl Gödel, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Wilhelm Haas, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Georg Pelzer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Jens Rieger, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Florian Bayer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Karl Gödel, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Wilhelm Haas, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Georg Pelzer, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Jens Rieger, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
André Ritter, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Thomas Weber, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Andrea Zang, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Jürgen Durst, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Thilo Michel, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Gisela Anton, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Thomas Weber, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Andrea Zang, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Jürgen Durst, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Thilo Michel, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Gisela Anton, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)
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