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Lens-term- and edge-effect in X-ray grating interferometry

DOI: 10.1364/BOE.6.004812 DOI Help
PMID: 26713196 PMID Help

Authors: Johannes Wolf (Technische Universitat Munchen) , Jonathan I. Sperl (2GE Global Research) , Florian Schaff (Technische Universitat Munchen) , Markus Schüttler (Technische Universitat Munchen) , Andre Yaroshenko (Technische Universitat Munchen) , Irene Zanette (Diamond Light Source) , Julia Herzen (Technische Universitat Munchen) , Franz Pfeiffer (Technische Universitat Munchen)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Biomedical Optics Express , VOL 6 (12) , PAGES 4812-4824

State: Published (Approved)
Published: November 2015

Open Access Open Access

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.

Subject Areas: Biology and Bio-materials


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