title: Correlation of X-ray dark-field radiography to mechanical sample properties.
abstract: The directional dark-field signal obtained with X-ray grating interferometry yields direction-dependent information about the X-ray scattering taking place inside the examined sample. It allows examination of its morphology without the requirement of resolving the micrometer size structures directly causing the scattering. The local morphology in turn gives rise to macroscopic mechanical properties of the investigated specimen. In this study, we investigate the relation between the biomechanical elasticity (Young's modulus) and the measured directional dark-field parameters of a well-defined sample made of wood. In our proof-of-principle experiment, we found a correlation between Young's modulus, the average dark-field signal, and the average dark-field anisotropy. Hence, we are able to show that directional dark-field imaging is a new method to predict mechanical sample properties. As grating interferometry provides absorption, phase-contrast, and dark-field data at the same time, this technique appears promising to combine imaging and mechanical testing in a single testing stage. Therefore, we believe that directional dark-field imaging will have a large impact in the materials science world.
authors.affiliation: 1Physik-Department,Technische Universität München,James-Franck-Str. 1,85748 Garching,Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Malecki
authors.affiliation: 1Physik-Department,Technische Universität München,James-Franck-Str. 1,85748 Garching,Germany.
authors.forename: Elena
authors.initials: E
authors.lastname: Eggl
authors.affiliation: 1Physik-Department,Technische Universität München,James-Franck-Str. 1,85748 Garching,Germany.
authors.forename: Florian
authors.initials: F
authors.lastname: Schaff
authors.affiliation: 1Physik-Department,Technische Universität München,James-Franck-Str. 1,85748 Garching,Germany.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Potdevin
authors.affiliation: 3Institut für Radiologie,Klinikum rechts der Isar,Technische Universität München,Ismaninger Straße 22,81675 München,Bavaria,Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Baum
authors.affiliation: 3Institut für Radiologie,Klinikum rechts der Isar,Technische Universität München,Ismaninger Straße 22,81675 München,Bavaria,Germany.
authors.forename: Eduardo Grande
authors.initials: EG
authors.lastname: Garcia
authors.affiliation: 4Abteilung für Neuroradiologie,Klinikum rechts der Isar,Technische Universität München,Ismaninger Straße 22,81675 München,Bavaria,Germany.
authors.forename: Jan S
authors.initials: JS
authors.lastname: Bauer
authors.affiliation: 1Physik-Department,Technische Universität München,James-Franck-Str. 1,85748 Garching,Germany.
authors.forename: Franz
authors.initials: F
authors.lastname: Pfeiffer