A5045078971- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced X-ray and CT Imaging
- Advanced Electron Microscopy Techniques and Applications
- Medical Imaging Techniques and Applications
- Crystallography and Radiation Phenomena
- Advanced MRI Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Nuclear Physics and Applications
- Natural Fiber Reinforced Composites
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Cellulose Research Studies
- Advancements in Photolithography Techniques
- Astrophysical Phenomena and Observations
- Bone Tissue Engineering Materials
- Optical measurement and interference techniques
- Anatomy and Medical Technology
- Advanced Neuroimaging Techniques and Applications
- Additive Manufacturing and 3D Printing Technologies
- Textile materials and evaluations
- Nuclear Materials and Properties
- Digital Holography and Microscopy
- Advanced Surface Polishing Techniques
- Medical Image Segmentation Techniques
Synchrotron soleil
2016-2025
Université de Bretagne Sud
2023
European Synchrotron Radiation Facility
2002-2022
Unité Matériaux et Transformations
2012-2013
Paul Scherrer Institute
2003-2011
University of Basel
2011
Karlsruhe Institute of Technology
2010-2011
Technical University of Munich
2011
AXO Dresden (Germany)
2010-2011
Ludwig-Maximilians-Universität München
2011
Using a high-efficiency grating interferometer for hard X rays (10–30 keV) and phase-stepping technique, separate radiographs of the phase absorption profiles bulk samples can be obtained from single set measurements. Tomographic reconstruction yields quantitative three-dimensional maps X-ray refractive index, with spatial resolution down to few microns. The method is mechanically robust, requires little coherence monochromaticity, scaled up large fields view, detector correspondingly...
A computer program named ANKAphase is presented that processes X-ray inline phase-contrast radiographs by reconstructing the projected thickness of object(s) imaged. The uses a single-distance non-iterative phase-retrieval algorithm described David Paganin et al. [(2002), J. Microsc. 206, 33-40]. Allowing for non-negligible absorption in sample, this method strictly valid only monochromatic illumination and single-material objects but tolerates deviations from these conditions, especially...
Direct beam x-ray imaging, with intense coherent monochromatic synchrotron radiation and a fast readout low noise detector has been used for in situ studies of cellular dendritic solidification Sn-Pb alloys. Temporal spatial resolutions down to $\ensuremath{\sim}0.7\mathrm{s}$ $\ensuremath{\sim}2.5\ensuremath{\mu}\mathrm{m}$, respectively, field view up $1{\mathrm{mm}}^{2}$ were obtained. The collected images display features from both phase amplitude contrast which, combined the attainable...
Human brain tissue belongs to the most impressive and delicate three-dimensional structures in nature. Its outstanding functional importance organism implies a strong need for imaging modalities. Although magnetic resonance provides deep insights, its spatial resolution is insufficient study structure on level of individual cells. Therefore, our knowledge microstructure currently relies two-dimensional techniques, optical electron microscopy, which generally require severe preparation...
We report on the design and experimental realization of a 2D x-ray grating interferometer. describe how this interferometer has been practically implemented, discuss its performance, present multidirectional scattering (dark-field) maps quantitative phase images that have retrieved using device.
The ESRF synchrotron beamline ID19, dedicated to full‐field parallel‐beam imaging techniques such as phase‐contrast and absorption microtomography X‐ray topography, is one of the most versatile instruments its kind. This paper presents key characteristics ID19 in present form, names examples for research development performed on beamline, outlines plans an upgrade coming years, adapt growing needs user community. technical goals envisioned include increase available beam size maximum photon...
X-ray grating interferometry is a coherent imaging technique that bears tremendous potential for three-dimensional tomographic of soft biological tissue and other specimens whose details exhibit very weak absorption contrast. It intrinsically trimodal, delivering phase contrast, scattering (“dark-field”) Recently reported acquisition strategies grating-interferometric tomography constitute major improvement dose efficiency speed. In particular, some these techniques eliminate the need...
We present an interferometric method to measure the shape of a hard-x-ray wavefront. The interferometer consists phase grating as beam splitter and absorption transmission mask for detector. device can be used wavefront gradients corresponding radii curvature large several dozens meters, with lateral resolution few microns. This corresponds detected distortions approximately 10−12m or λ∕100. was 12.4 keV x rays slope error height profile x-ray mirror. Surface variations periods ranging from...
Silicon refractive planar parabolic lenses with minimized absorption were fabricated by a combination of photolithography and dry-etching techniques. Focusing spectral properties the studied synchrotron radiation in energy range 8–25 keV at European Synchrotron Radiation Facility. A focal spot 1.8 μm gain 18.5 transmission more then 80% was measured 15.6 keV. The characteristics analyzed taking into account material dispersion photon-energy attenuation hard x-ray range.
The coherence requirements for efficient operation of an X-ray grating interferometer are discussed. It is shown how a Talbot-Lau geometry, in which array equidistant secondary sources used, can be used to decouple fringe visibility the (and thus, its efficiency) from total size source. This principle phase-contrast radiography and tomography with low brilliance, such as tubes.
We report a quantitative measurement of the full transverse coherence function 14.4 keV x-ray radiation produced by an undulator at Swiss Light Source. An grating interferometer consisting beam splitter phase and analyzer amplitude has been used to measure degree as separation out 30 microm. Importantly, technique provides model-free spatially resolved complex is not restricted high resolution detectors small fields view. The spatial characterization wave front important applications in...
Recently a novel grating based x-ray imaging approach called directional dark-field was introduced. Directional yields information about the local texture of structures smaller than pixel size system. In this work we extend theoretical description and data processing schemes for to strongly scattering systems, which could not be described previously. We develop simple model account these recent observations subsequently demonstrate using experimental data. The includes images polypropylene...
X-ray phase-contrast imaging has received growing interest in recent years due to its high capability visualizing soft tissue. Breast became the focus of particular attention as it is considered most promising candidate for a first clinical application this contrast modality. In study, we investigate quantitative breast tissue characterization using grating-based computed tomography (CT) at conventional polychromatic x-ray sources. Different specimens have been scanned laboratory setup and...
Water extraction from plants by evaporation is ubiquitous in nature, and essential for most uses of wood-based products, yet little known about the internal drying mechanisms. The authors use NMR x-ray computed tomography to observed effects at different length scales. In typical porous media due mainly capillary effects, but wood structure's bound water controls free liquid pores, throughout process. Transfers between seem play a major role interaction plantlike systems with water, this...
Abstract The ANATOMIX beamline at Synchrotron SOLEIL, operational since 2018, is dedicated to hard X-ray full-field tomography techniques. Operating in a range of photon energies from approximately 5 50 keV, it offers both parallel-beam projection microtomography, absorption and phase contrast, nanotomography using zone-plate transmission microscope. With these methods, the covers spatial resolution 20 nm µm, expressed terms useful pixel size. variable beam size up 40 mm allows users image...
An increasing number of CAD/CAM (computer-aided design/computer-aided manufacturing) hybrid materials have been introduced to the dental market in recent years. In addition, for additive manufacturing (AM) are becoming more attractive digital dentistry. Studies on material microstructures using micro-computed tomography (µ-CT) combined with scanning electron microscopy (SEM) only available a limited extent so far. One three-dimensional- (3D-) printable (VarseoSmile Crown plus) and two...
A systematic study is presented in which multilayers of different composition (W/Si, Mo/Si, Pd/B(4)C), periodicity (from 2.5 to 5.5 nm) and number layers have been characterized. In particular, the intrinsic quality (roughness reflectivity) as well performance (homogeneity coherence outgoing beam) a monochromator for synchrotron radiation hard X-ray micro-imaging are investigated. The results indicate that material dominating factor performance. By helping scientists engineers specify design...