Experimental validation of image contrast correlation between ultra-small-angle X-ray scattering and grating-based dark-field imaging using a laser-driven compact X-ray source

Experimentelle Verifizierung des Zusammenhangs zwischen Röntgen-Kleinwinkelstreuung und gitter-basierter Röntgen-Dunkelfeldbildgebung unter Verwendung eines laser-getriebenen Kompaktsynchrotrons

Martin Bech 1 , Simone Schleede 1 , Guillaume Potdevin 1 , Klaus Achterhold 1 , Oliver Bunk 2 , Torben H. Jensen 3 , Rod Loewen 4 , Ron Ruth, and Franz Pfeiffer 2
  • 1 Department of Physics and Institute for Medical Engineering (IMETUM), Technische Universität München, James-Franck-Strasse 1, 85748 Garching, Germany
  • 2 Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
  • 3 Niels Bohr Institut, Universitetsparken 5, 2100 Copenhagen, Denmark
  • 4 Lyncean Technologies Inc., 370 Portage Avenue, Palo Alto, CA 94306, USA
  • 5 Stanford Linear Accelerator Center, 2575 Sand Hill Road, Menlo Park, CA 94025, USA

Abstract

X-ray phase and dark-field contrast have recently been the source of much attention in the field of X-ray imaging, as they both contribute new imaging signals based on physical principles that differ from conventional X-ray imaging. With a so-called Talbot grating interferometer, both phase-contrast and dark-field images are obtained simultaneously with the conventional attenuation-based X-ray image, providing three complementary image modalities that are intrinsically registered. Whereas the physical contrast mechanisms behind attenuation and phase contrast are well understood, a formalism to describe the dark-field signal is still in progress. In this article, we report on correlative experimental results obtained with a grating interferometer and with small-angle X-ray scattering. Furthermore, we use a proposed model to quantitatively describe the results, which could be of great importance for future clinical and biomedical applications of grating-based X-ray imaging.

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