Noise reduction for single-shot grating-based phase-contrast imaging at an x-ray backlighter

Schreiner S, Akstaller B, Dietrich L, Meyer P, Neumayer P, Schuster M, Wolf A, Zielbauer B, Ludwig V, Michel T, Anton G, Funk S (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Journal of Imaging MDPI

Book Volume: 7

Article Number: 178

Journal Issue: 9

DOI: 10.3390/jimaging7090178

Abstract

X-ray backlighters allow the capture of sharp images of fast dynamic processes due to extremely short exposure times. Moiré imaging enables simultaneously measuring the absorption and differential phase-contrast (DPC) of these processes. Acquiring images with one single shot limits the X-ray photon flux, which can result in noisy images. Increasing the photon statistics by repeating the experiment to gain the same image is not possible if the investigated processes are dynamic and chaotic. Furthermore, to reconstruct the DPC and transmission image, an additional measurement captured in absence of the object is required. For these reference measurements, shot-to-shot fluctuations in X-ray spectra and a source position complicate the averaging of several reference images for noise reduction. Here, two approaches of processing multiple reference images in combination with one single object image are evaluated regarding the image quality. We found that with only five reference images, the contrast-to-noise ratio can be improved by approximately 13% in the DPC image. This promises improvements for short-exposure single-shot acquisitions of rapid processes, such as laser-produced plasma shock-waves in high-energy density experiments at backlighter X-ray sources such as the PHELIX high-power laser facility.

Authors with CRIS profile

Stephan Schreiner Lehrstuhl für Physik Bernhard Akstaller Naturwissenschaftliche Fakultät Lisa Dietrich Chair of Applied Physics Max Schuster Lehrstuhl für Physik Andreas Wolf Lehrstuhl für Physik Veronika Ludwig Lehrstuhl für Experimentelle Astroteilchenphysik Thilo Michel Lehrstuhl für Experimentelle Astroteilchenphysik Gisela Anton Lehrstuhl für Experimentelle Astroteilchenphysik Stefan Funk Lehrstuhl für Physik

Involved external institutions

GSI Helmholtzzentrum für Schwerionenforschung GmbH DE Germany (DE) Karlsruhe Institute of Technology (KIT) DE Germany (DE)

How to cite

APA:

Schreiner, S., Akstaller, B., Dietrich, L., Meyer, P., Neumayer, P., Schuster, M.,... Funk, S. (2021). Noise reduction for single-shot grating-based phase-contrast imaging at an x-ray backlighter. Journal of Imaging, 7(9). https://dx.doi.org/10.3390/jimaging7090178

MLA:

Schreiner, Stephan, et al. "Noise reduction for single-shot grating-based phase-contrast imaging at an x-ray backlighter." Journal of Imaging 7.9 (2021).

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