Lens-term-and edge-effect in X-ray grating interferometry
Wolf J, Sperl JI, Schaff F, Schuettler M, Yaroshenko A, Zanette I, Herzen J, Pfeiffer F (2015)
Publication Type: Journal article
Publication year: 2015
Journal
Book Volume: 6
Pages Range: 4812-4824
Article Number: 246902
Journal Issue: 12
DOI: 10.1364/BOE.6.004812
Abstract
X-ray grating interferometry requires gratings with periods in the micrometer range and allows the acquisition of the dark-field contrast. The analyzer grating is designed to match the period of the interference pattern in order to translate it into a measurable intensity modulation. In this study, we explore the influence of a sample-induced mismatch between the interference pattern and the analyzer grating on the dark-field contrast. We propose a formula for the calculation of the signal due to a period mismatch and present estimations varying periods and detector pixel size. Furthermore, numerical simulations of the X-ray wave-front demonstrate that the wave-front curvature, described by the lens-term, e.g. behind a parabolic lens or edges of a sample can change the period of the interference pattern. Our results give a concrete explanation for the formation of a dark-field contrast from object edges and thus allow a better understanding of the dark-field signal obtained with a grating interferometer.
Involved external institutions
Technische Universität München (TUM)
Germany (DE)
General Electric Global Research
United States (USA) (US)
Germany (DE)
General Electric Global Research
United States (USA) (US)
How to cite
APA:
Wolf, J., Sperl, J.I., Schaff, F., Schuettler, M., Yaroshenko, A., Zanette, I.,... Pfeiffer, F. (2015). Lens-term-and edge-effect in X-ray grating interferometry. Biomedical Optics Express, 6(12), 4812-4824. https://doi.org/10.1364/BOE.6.004812
MLA:
Wolf, Johannes, et al. "Lens-term-and edge-effect in X-ray grating interferometry." Biomedical Optics Express 6.12 (2015): 4812-4824.
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