A fast alignment method for grating-based X-ray phase-contrast imaging systems

Schuster, Max; Ludwig, Veronika; Akstaller, Bernhard; Seifert, Maria; Wolf, Andreas; Michel, Thilo; Neumayer, P.; Funk, S.; Anton, G.

doi:10.1088/1748-0221/14/08/p08003

Cited by 5 publications

(13 citation statements)

References 41 publications

(52 reference statements)

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“…Furthermore, the distances between the two gratings match the Talbot distance of the G1 grating, calculated for the expected 11 keV. The alignment process of the portable interferometer with respect to the backligher source was performed using the fast-alignment method described in [28]. 20 mm 75 mm 726 mm 868 mm X-rays laser object 10 µm G1 phase grating 6 µm G2 absorption grating imaging plate detector tungsten wire Figure 3.…”

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

“…In 2020, Bouffetier et al [ 22 ] managed to average a large amount of images taken with a three-grating Talbot–Lau setup at a high-repetition-rate backlighter K- α source and reconstruct low-noise images from that. If the X-ray source has sufficient spatial coherence, the source grating can be omitted [ 14 , 28 ], allowing us to use a two-grating setup. This increases the photon flux.…”

Section: Introductionmentioning

confidence: 99%

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Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

et al. 2021

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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 imagesin 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.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

et al. 2021

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“…The horizontal size is about 10 μm to 20 μm depending on the laser intensity [34]. Thus, the thin backlighter wire provides x-rays with sufficient spatial coherence, so that a good moiré visibility can be achieved without using a source grating [14,27].…”

Section: Instrumentationmentioning

confidence: 99%

“…Furthermore, using only two instead of three gratings increases the photon-flux at the detector and improves the flexibility of the setup. Phase and attenuation images were obtained with a robust two-grating phase-contrast setup that was aligned using a fast alignment method [27]. In-line signatures were identified in the transmission images and evaluated separately to confirm the findings from the phase-reconstructions.…”

Section: Introductionmentioning

confidence: 99%

Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source

et al. 2021

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A single-shot x-ray phase-contrast imaging technique with short exposure time allows to capture sharp images of fast dynamic processes despite low absorption contrast. We demonstrate the capabilities of a robust single-shot grating-based phase-contrast imaging setup at the Petawatt High-Energy Laser for Heavy Ion EXperiments (PHELIX) at the GSI Helmholtzzentrum für Schwerionenforschung GmbH. A static test sample was imaged at 47-fold magnification using a laser-driven high-energy x-ray backlighter source. The retrieved transmission and phase-contrast images yield reproducible results. The reconstructed differential phase-images are quantitatively explained. In addition to the phase-images, propagation signatures are found in the data and used for result verification. The obtained results demonstrate the capabilities of the grating setup which can be used to image microscopic dynamic processes in high-energy density plasma experiments at PHELIX or similar high-power laser facilities.

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Demonstrating grating-based phase-contrast imaging of laser-driven shock waves

Wegert,

Schreiner,

Rauch

et al. 2024

Matter and Radiation at Extremes

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Single-shot X-ray phase-contrast imaging is used to take high-resolution images of laser-driven strong shock waves. Employing a two-grating Talbot interferometer, we successfully acquire standard absorption, differential phase-contrast, and dark-field images of the shocked target. Good agreement is demonstrated between experimental data and the results of two-dimensional radiation hydrodynamics simulations of the laser–plasma interaction. The main sources of image noise are identified through a thorough assessment of the interferometer’s performance. The acquired images demonstrate that grating-based phase-contrast imaging is a powerful diagnostic tool for high-energy-density science. In addition, we make a novel attempt at using the dark-field image as a signal modality of Talbot interferometry to identify the microstructure of a foam target.

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A fast alignment method for grating-based X-ray phase-contrast imaging systems

Cited by 5 publications

References 41 publications

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

Noise Reduction for Single-Shot Grating-Based Phase-Contrast Imaging at an X-ray Backlighter

Single-shot grating-based phase-contrast imaging of a micrometer sample at a laser-driven x-ray backlighter source

Demonstrating grating-based phase-contrast imaging of laser-driven shock waves

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