Applications of Laboratory-Based Phase-Contrast Imaging Using Speckle Tracking Technique towards High Energy X-Rays

Zhou, Tao; Yang, Fei; Kaufmann, R.; Wang, Hongchang

doi:10.3390/jimaging4050069

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…Extending spackle-based imaging, in particular X-ray speckle tracking (XST), to higher energies in laboratory settings is the ambitious goal of Tunhe Zhou and Fei Yang, a close collaboration between the Swiss EMPA (Eidgenössische Materialprüfungs-und Forschungsanstalt) and Diamond Light Source, UK [10]. Replacing the "standard" sandpaper which has been often used as diffusor for XST with steel wool, Zhou and her coauthors produce a random polychromatic speckle pattern in cone beam geometry with an average visibility of 17% at 80 kVp acceleration voltage, which is outstandingly good.…”

Section: Data Methods and Resultsmentioning

confidence: 99%

Phase-Contrast and Dark-Field Imaging

Zabler¹

2018

J. Imaging

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Very early, in 1896, Wilhelm Conrad Röntgen, the founding father of X-rays, attempted to measure diffraction and refraction by this new kind of radiation, in vain. Only 70 years later, these effects were measured by Ulrich Bonse and Michael Hart who used them to make full-field images of biological specimen, coining the term phase-contrast imaging. Yet, another 30 years passed until the Talbot effect was rediscovered for X-radiation, giving rise to a micrograting based interferometer, replacing the Bonse–Hart interferometer, which relied on a set of four Laue-crystals for beam splitting and interference. By merging the Lau-interferometer with this Talbot-interferometer, another ten years later, measuring X-ray refraction and X-ray scattering full-field and in cm-sized objects (as Röntgen had attempted 110 years earlier) became feasible in every X-ray laboratory around the world. Today, now that another twelve years have passed and we are approaching the 125th jubilee of Röntgen’s discovery, neither Laue-crystals nor microgratings are a necessity for sensing refraction and scattering by X-rays. Cardboard, steel wool, and sandpaper are sufficient for extracting these contrasts from transmission images, using the latest image reconstruction algorithms. This advancement and the ever rising number of applications for phase-contrast and dark-field imaging prove to what degree our understanding of imaging physics as well as signal processing have advanced since the advent of X-ray physics, in particular during the past two decades. The discovery of the electron, as well as the development of electron imaging technology, has accompanied X-ray physics closely along its path, both modalities exploring the applications of new dark-field contrast mechanisms these days. Materials science, life science, archeology, non-destructive testing, and medicine are the key faculties which have already integrated these new imaging devices, using their contrast mechanisms in full. This special issue “Phase-Contrast and Dark-field Imaging” gives us a broad yet very to-the-point glimpse of research and development which are currently taking place in this very active field. We find reviews, applications reports, and methodological papers of very high quality from various groups, most of which operate X-ray scanners which comprise these new imaging modalities.

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Section: Data Methods and Resultsmentioning

confidence: 99%

Phase-Contrast and Dark-Field Imaging

Zabler¹

2018

J. Imaging

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“…Multimodal XST phase tomography was reported at a laboratory source using an average energy of 40 keV [Zhou et al, 2018d]. For this demonstration, a stack of coarse sandpaper was used as a diffuser.…”

Section: Implementation and Optimisation At High X-ray Energiesmentioning

confidence: 99%

“…To overcome the limited visibility of the speckle pattern for some applications such as the implementation with low-coherence X-rays and/or high-energy X-rays, it was proposed to use a random absorption mask rather than a phase mask to produce a reference pattern that does not rely on interference effects . The feasibility of this approach was demonstrated with high-energy X-rays from synchrotron sources and at low-coherence laboratory sources Zhou et al, 2018d]. Following the first demonstrations with steel wool, engineered porous materials such as aluminium-copper and magnesium-zinc alloys as well as limestone and mortar were also tested as absorption masks .…”

Section: Previous Workmentioning

confidence: 99%

“…First demonstrations of these were already briefly mentioned in Chapter 5 (Section 5.10.3) on high-energy speckle imaging and include 2D projection imaging of thin slices of volcanic rocks using the 1D XSS method Zhou et al, 2018a] and 3D XST tomography of a mortar specimen [Zhou et al, 2018d].…”

Section: Previous Workmentioning

confidence: 99%

“…Projection imaging was performed in these cases using the 1D XSS mode [Wang et al, 2016a,b] 6 and the most recently introduced optical flow method . Furthermore, tomographic imaging has been reported with the single-shot XST mode at a microfocus source [Zhou et al, 2018d]. In these demonstrations, absorption masks of large-grain sandpaper or steel wool were used and speckles are generated mainly by absorption effects 7 .…”

Section: Previous Workmentioning

confidence: 99%

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X-ray Phase-Contrast Imaging Using Near-Field Speckles

Zdora¹

2021

Springer Theses

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In the last decades, X-ray phase-contrast imaging has proven to be a powerful method for unveiling the inner structure of samples and is capable of visualising even minute density differences. Recently, speckle-based imaging (SBI), the youngest X-ray phase-sensitive technique, has received great interest due to its high sensitivity, quantitative character and relaxed requirements on the setup components and beam properties. This thesis is focussed on the development, experimental optimisation and applications of SBI, with the aim of simplifying its implementation, increasing its flexibility and expanding its potential.For this, a robust, flexible data acquisition and reconstruction approach, the unified modulated pattern analysis (UMPA), was developed, which lifts previous constraints of SBI. UMPA allows for tuning of the sensitivity and spatial resolution by adjusting the scan and reconstruction parameters. It is applicable not only to random speckle, but also periodic interference patterns, bridging the gap and improving the performance of both speckle-and single-grating-based techniques.Following the first demonstration of UMPA, its potential for a range of applications is illustrated in this thesis. It is shown that UMPA can be employed for X-ray optics characterisation to quantify aberrations in the focussing behaviour of X-ray refractive lenses with high precision and accuracy. UMPA phase tomography is applied to the field of biomedical imaging for high-sensitivity three-dimensional (3D) virtual histology of unstained, hydrated soft tissue, giving unprecedented structural and quantitative density information.Further developments of SBI explored in this thesis include the testing of novel customisable speckle diffusers, the extension of SBI to higher X-ray energies for geology and materials science applications, and the demonstration of UMPA at a laboratory X-ray source. These progresses promise new possibilities of SBI for high-sensitivity, robust and high-throughput imaging in previously inaccessible fields and make SBI accessible to a wider range of users in research and industry.

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Principles and State of the Art of X-ray Speckle-Based Imaging

Zdora

2021

X-Ray Phase-Contrast Imaging Using Near-Field Speckles

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Applications of Laboratory-Based Phase-Contrast Imaging Using Speckle Tracking Technique towards High Energy X-Rays

Cited by 10 publications

References 37 publications

Phase-Contrast and Dark-Field Imaging

Phase-Contrast and Dark-Field Imaging

X-ray Phase-Contrast Imaging Using Near-Field Speckles

Principles and State of the Art of X-ray Speckle-Based Imaging

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