Zobrazeno 1 - 10
of 396
pro vyhledávání: '"Paganin, David M"'
Autor:
Aminzadeh, Alaleh, Kingston, Andrew M., Roberts, Lindon, Paganin, David M., Petersen, Timothy C., Svalbe, Imants D.
Scanning objects with a more tightly focused beam (for example of photons or electrons) can provide higher-resolution images. However the stronger localisation of energy deposition can damage tissues in organic samples or may rearrange the chemical s
Externí odkaz:
http://arxiv.org/abs/2410.18348
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:
Croughan, Michelle K, Paganin, David M, Alloo, Samantha J, Ahlers, Jannis N, How, Ying Ying, Harker, Stephanie A, Morgan, Kaye S.
In recent years, a novel x-ray imaging modality has emerged that reveals unresolved sample microstructure via a "dark-field image", which provides complementary information to conventional "bright-field" images, such as attenuation and phase-contrast
Externí odkaz:
http://arxiv.org/abs/2404.17612
Autor:
Arhatari, Benedicta D., Paganin, David M., Kirkwood, Henry, Tremsin, Anton S., Gureyev, Timur E., Korsunsky, Alexander M., Kockelmann, Winfried, Hofmann, Felix, Huwald, Eric, Zhang, Shu-Yan, Kelleher, Joe, Abbey, Brian
Publikováno v:
Physical Review A 109, 053529 (2024)
Micro-channel plate (MCP) detectors, when used at pulsed-neutron-source instruments, offer the possibility of high spatial resolution and high contrast imaging with pixel-level spectroscopic information. Here we demonstrate the possibility of multimo
Externí odkaz:
http://arxiv.org/abs/2311.16159
Autor:
Dwyer, Christian, Paganin, David M.
Publikováno v:
Physical Review B 110, 024110 (2024)
We analyze the quantum limit of sensitivity in four-dimensional scanning transmission electron microscopy (4D-STEM), which has emerged as a favored technique for imaging the structure of a wide variety of materials, including biological and other rad
Externí odkaz:
http://arxiv.org/abs/2309.04701
Autor:
Ceddia, David, Aminzadeh, Alaleh, Cook, Philip K., Pelliccia, Daniele, Kingston, Andrew M., Paganin, David M.
Publikováno v:
Optica Vol. 10, No. 8, 1067-1073 (2023)
The penetrating power of X rays underpins important applications such as medical radiography. However, this same attribute makes it challenging to achieve flexible on-demand patterning of X-ray beams. One possible path to this goal is ``ghost project
Externí odkaz:
http://arxiv.org/abs/2303.12809
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
Publikováno v:
Physical Review A 108, 013517 (2023)
Unresolved spatially-random microstructure, in an illuminated sample, can lead to position-dependent blur when an image of that sample is formed. For a small propagation distance, between the exit surface of the sample and the entrance surface of a p
Externí odkaz:
http://arxiv.org/abs/2301.09046
The size of the smallest detectable sample feature in an x-ray imaging system is usually restricted by the spatial resolution of the system. This limitation can now be overcome using the diffusive dark-field signal, which is generated by unresolved p
Externí odkaz:
http://arxiv.org/abs/2212.02253
Complementary to conventional and phase X-ray radiography, dark-field imaging has become central in visualizing diffusive scattering signal due to the spatially-unresolved texture within an object. To date most diffusive-dark-field retrieval methods
Externí odkaz:
http://arxiv.org/abs/2211.07399