Hard X-ray dark-field imaging with incoherent sample illumination

Endrizzi, Marco; Diémoz, Paul C.; Millard, T. P.; Jones, J. Louise; Speller, Robert; Robinson, Ian; Olivo, Alessandro

doi:10.1063/1.4861855

Cited by 158 publications

(158 citation statements)

References 40 publications

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“…It is useful to express I as a sum of Gaussian functions [22] in order to separate the contributions from the (known) IF and the (unknown) sample:…”

Section: Methodsmentioning

confidence: 99%

“…Edge illumination (EI) [19] was developed at a synchrotron facility and later translated to laboratory sources [20]. It has been shown to provide high resolution, quantitative phase, and dark field images [21][22][23]. Low spatial and temporal coherence is extremely well tolerated by the technique, which is also stable against thermal and mechanical stresses [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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

2018

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Abstract:A multi-aperture analyser set-up was recently developed for X-ray phase contrast imaging and tomography, simultaneously attaining a high sensitivity and wide dynamic range. We present a single-shot image retrieval algorithm in which differential phase and dark-field images are extracted from a single intensity projection. Scanning of the object is required to build a two-dimensional image, because only one pre-sample aperture is used in the experiment reported here. A pure-phase object approximation and a hierarchical approach to the data analysis are used in order to overcome numerical instabilities. The single-shot capability reduces the exposure times by a factor of five with respect to the standard implementation and significantly simplifies the acquisition procedure by only requiring sample scanning during data collection.

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“…It is useful to express I as a sum of Gaussian functions [22] in order to separate the contributions from the (known) IF and the (unknown) sample:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2018

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“…Although a lab-based system is more suitable for delicate heritage artefacts, it should be noted that this system had been built for research into medical imaging applications and improved performance would be expected from a system optimised specifically for imaging cartonnage. The field of view is ~ 2 cm × 5 cm and multiple images, showing parameters such as X-ray absorption, refraction and scatter width are obtained [32,33].…”

Section: X-ray Phase Contrast Imagingmentioning

confidence: 99%

An assessment of multimodal imaging of subsurface text in mummy cartonnage using surrogate papyrus phantoms

Gibson¹,

Piquette²,

Bergmann

et al. 2018

Herit Sci

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Ancient Egyptian mummies were often covered with an outer casing, panels and masks made from cartonnage: a lightweight material made from linen, plaster, and recycled papyrus held together with adhesive. Egyptologists, papyrologists, and historians aim to recover and read extant text on the papyrus contained within cartonnage layers, but some methods, such as dissolving mummy casings, are destructive. The use of an advanced range of different imaging modalities was investigated to test the feasibility of non-destructive approaches applied to multi-layered papyrus found in ancient Egyptian mummy cartonnage. Eight different techniques were compared by imaging four synthetic phantoms designed to provide robust, well-understood, yet relevant sample standards using modern papyrus and replica inks. The techniques include optical (multispectral imaging with reflection and transillumination, and optical coherence tomography), X-ray (X-ray fluorescence imaging, X-ray fluorescence spectroscopy, X-ray micro computed tomography and phase contrast X-ray) and terahertz-based approaches. Optical imaging techniques were able to detect inks on all four phantoms, but were unable to significantly penetrate papyrus. X-ray-based techniques were sensitive to iron-based inks with excellent penetration but were not able to detect carbon-based inks. However, using terahertz imaging, it was possible to detect carbon-based inks with good penetration but with less sensitivity to ironbased inks. The phantoms allowed reliable and repeatable tests to be made at multiple sites on three continents. The tests demonstrated that each imaging modality needs to be optimised for this particular application: it is, in general, not sufficient to repurpose an existing device without modification. Furthermore, it is likely that no single imaging technique will to be able to robustly detect and enable the reading of text within ancient Egyptian mummy cartonnage. However, by carefully selecting, optimising and combining techniques, text contained within these fragile and rare artefacts may eventually be open to non-destructive imaging, identification, and interpretation.

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“…An additional imaging modality, sensitive to ultra-small angle scattering, has been demonstrated using analyzer crystals [10], grating interferometers [11] and coded apertures [12]. Ultra-small angle scattering originates from the elastic interaction of x-rays with submicron structures within a sample.…”

Section: Introductionmentioning

confidence: 99%

Multi-modal hard x-ray imaging with a laboratory source using selective reflection from a mirror

Pelliccia

Paganin

2014

Biomed. Opt. Express

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Multi-modal hard x-ray imaging sensitive to absorption, refraction, phase and scattering contrast is demonstrated using a simple setup implemented with a laboratory source. The method is based on selective reflection at the edge of a mirror, aligned to partially reflect a pencil x-ray beam after its interaction with a sample. Quantitative scattering contrast from a test sample is experimentally demonstrated using this method. Multi-modal imaging of a house fly (Musca domestica) is shown as proof of principle of the technique for biological samples. References and links1. A. Bravin, P. Coan, and P. Suortti, "X-ray phase-contrast imaging: from pre-clinical applications towards clinics," Phys. Med. Biol. 58(1), R1-R35 (2013). 2. U. Bonse and M. Hart, "An X-ray interferometer," Appl. Phys. Lett. 6(8), 155-156 (1965). 3. S. W. Wilkins, T. E. Gureyev, D. Gao, A. Pogany, and A. W. Stevenson, "Phase-contrast imaging using polychromatic hard X-rays," Nature 384(6607), 335-338 (1996). 4. A. Momose, "Demonstration of phase-contrast X-ray computed tomography using an X-ray interferometer,"Nucl. Instrum. Vallazza, and E. Castelli, "An innovative digital imaging set-up allowing a low-dose approach to phase contrast applications in the medical field," Med.

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Hard X-ray dark-field imaging with incoherent sample illumination

Cited by 158 publications

References 40 publications

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

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

An assessment of multimodal imaging of subsurface text in mummy cartonnage using surrogate papyrus phantoms

Multi-modal hard x-ray imaging with a laboratory source using selective reflection from a mirror

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