Single-Shot X-ray Phase Retrieval through Hierarchical Data Analysis and a Multi-Aperture Analyser

Endrizzi, Marco; Vittoria, Fabio A.; Olivo, Alessandro

doi:10.3390/jimaging4060076

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Another nonconventional technique, namely Edge Illumination (EI), has evolved simultaneously to the Talbot-Lau interferometer, yielding images very similar to DIC and DPC. The report from Marco Endrizzi from Alessandro Olivio's group at University College London (UCL) is the latest hallmark in data analysis from EI imaging [11]. Endrizzi's method first reduces pixel sampling by binning to avoid artifacts which arise from high-frequency noise.…”

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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“…A single frame collected with a system like the one depicted in Fig 1(a) will contain a mixture of attenuation, differential phase and dark field contributions. Although we have started to develop methods that, under special conditions, enable the retrieval of more than one contrast channel from a single input image [22], broadly speaking multiple input frames are required to separate phase, attenuation and dark field images. Still with reference to Fig.…”

Section: Built For Speed: Single-shot Phase Retrievalmentioning

confidence: 99%

“…We recently showed that "multi-aperture" EI setups allow combining high phase sensitivity with large dynamic range in USAXS measurements [38], while opening the way to single-shot retrieval of multiple contrast channels [22]. In parallel, we have started to experiment with lab-based focusing of low-energy x-rays to further increase the phase sensitivity in soft matter applications, an example of which is provided in figure 4.…”

Section: Recent Developments and Future Directionsmentioning

confidence: 99%

Flexible solutions for lab-based phase contrast and dark field CT and micro-CT

Olivo¹,

Vittoria²,

Modregger³

et al. 2019

eJNDT

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Phase-based (PB) x-ray imaging (XRI) methods have grown in importance over recent years, and it can probably be argued that the majority of micro-CT experiments at synchrotrons include phase effects in some form or fashion. A comparable if not higher level of interest has consequently arisen with regards to the translation of PB XRI into lab-based CT and micro-CT system, where however things have been moving more slowly, and the opposite is probably true i.e. most acquisitions are currently non-PB. The reasons for this are multiple and varied, but the key ones may be attributable to setup complexity and to the necessity to move optical elements during acquisitions, limits in spatial resolution, and excessively long acquisition times. In the imaging of biological tissues, especially in vivo, excessive delivered dose can pose an additional concern. Based on the acceptance that a “one size fits all solution” probably does not exist, and that most real world applications typically do not require all the above features simultaneously, our group has focused on the development of a flexible approach where typically counteracting features (e.g. high spatial resolution and fast acquisition times) can be traded off, including while making use of the same imaging system after this has been designed and built. This paper briefly reviews the technical innovations that have made the above possible, presents some key results in various areas of application, and discusses areas currently undergoing further development, among which are extensions to both higher and lower energy x-ray spectra, and new approaches to multimodality and data retrieval.

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X-Ray Phase Contrast Methods

Mayo¹,

Endrizzi²

2019

Handbook of Advanced Nondestructive Evaluation

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Single-Shot X-ray Phase Retrieval through Hierarchical Data Analysis and a Multi-Aperture Analyser

Cited by 5 publications

References 28 publications

Phase-Contrast and Dark-Field Imaging

Phase-Contrast and Dark-Field Imaging

Flexible solutions for lab-based phase contrast and dark field CT and micro-CT

X-Ray Phase Contrast Methods

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