Zobrazeno 1 - 10
of 682
pro vyhledávání: '"Pavlov, A. M."'
Autor:
Alloo, Samantha J., Paganin, David M., Croughan, Michelle K., Ahlers, Jannis N., Pavlov, Konstantin M., Morgan, Kaye S.
A key contribution to X-ray dark-field (XDF) is X-ray diffusion by sample structures smaller than the imaging system's spatial resolution. However, some XDF techniques report that resolvable sample edges also generate XDF. Speckle-based X-ray imaging
Externí odkaz:
http://arxiv.org/abs/2410.18317
Autor:
Gureyev, T. E., Hall, C., Arhatari, B., Pelliccia, D., Aminzadeh, A., Pavlov, K. M., Quiney, H. M.
Publikováno v:
Optics Express, vol.32, no.11, pp.19294-19307, 2024
Young double-slit experiments using monochromatic hard X-rays with the energy of 25 keV are presented. The experiments were performed at a synchrotron source with a distance of 110 m between the interferometer and the detector to produce an interfere
Externí odkaz:
http://arxiv.org/abs/2402.07377
Publikováno v:
Optica 11(8), 1182-1191 (2024)
Dark-field X-ray imaging is a novel modality which visualises scattering from unresolved microstructure. Most dark-field imaging techniques rely on crystals or structured illumination, but recent work has shown that dark-field effects are observable
Externí odkaz:
http://arxiv.org/abs/2309.15874
Publikováno v:
Scientific Reports 13, 5424 (2023)
Speckle-based phase-contrast X-ray imaging (SB-PCXI) can reconstruct high-resolution images of weakly-attenuating materials that would otherwise be indistinguishable in conventional attenuation-based imaging. The experimental setup of SB-PCXI require
Externí odkaz:
http://arxiv.org/abs/2302.01288
A new method is developed for three-dimensional (3D) reconstruction of multi-material objects using propagation-based X-ray phase-contrast tomography (PB-CT) with phase retrieval via the contrast transfer function (CTF) formalism. The approach differ
Externí odkaz:
http://arxiv.org/abs/2206.02688
Autor:
Alloo, Samantha J., Paganin, David M., Morgan, Kaye S., Gureyev, Timur E., Mayo, Sherry C., Mohammadi, Sara, Lockie, Darren, Menk, Ralf Hendrik, Arfelli, Fulvia, Zanconati, Fabrizio, Tromba, Giuliana, Pavlov, Konstantin M.
Publikováno v:
Optics Letters 47, 1945-1948 (2022)
Propagation-based phase-contrast X-ray imaging (PB-PCXI) generates image contrast by utilizing sample-imposed phase-shifts. This has proven useful when imaging weakly-attenuating samples, as conventional attenuation-based imaging does not always prov
Externí odkaz:
http://arxiv.org/abs/2110.06284
Autor:
Pavlov, Konstantin M., Paganin, David M., Morgan, Kaye S., Heyang, Li, Berujon, Sebastien, Quénot, Laurène, Brun, Emmanuel
Publikováno v:
Phys. Rev. A 104, 053505 (2021)
When a macroscopic-sized non-crystalline sample is illuminated using coherent x-ray radiation, a bifurcation of photon energy flow may occur. The coarse-grained complex refractive index of the sample may be considered to attenuate and refract the inc
Externí odkaz:
http://arxiv.org/abs/2105.10693
Publikováno v:
Journal of Synchrotron Radiation, 28, 283-291 (2021)
Analyser-Based Phase-Contrast imaging (ABPCI) is a phase-contrast imaging method that produces high contrast images of weakly absorbing materials. However, it is only sensitive to phase variations lying in the diffraction plane of the analyser crysta
Externí odkaz:
http://arxiv.org/abs/2007.10520
Autor:
Pavlov, Konstantin M., Paganin, David M., Li, Heyang, Berujon, Sebastien, Rougé-Labriet, Hélène, Brun, Emmanuel
Publikováno v:
Journal of Optics 22 125604 (2020)
We develop X-ray Multi-modal Intrinsic-Speckle-Tracking (MIST), a form of X-ray speckle-tracking that is able to recover both the position-dependent phase shift and the position-dependent small-angle X-ray scattering (SAXS) signal of a phase object.
Externí odkaz:
http://arxiv.org/abs/1911.06814
Autor:
Pavlov, Konstantin M., Heyang, Li, Paganin, David M., Berujon, Sebastien, Rougé-Labriet, Hélène, Brun, Emmanuel
Publikováno v:
Phys. Rev. Applied 13, 054023 (2020)
We develop a means for speckle-based phase imaging of the projected thickness of a single-material object, under the assumption of illumination by spatially random time-independent x-ray speckles. These speckles are generated by passing x rays throug
Externí odkaz:
http://arxiv.org/abs/1908.00411