Zobrazeno 1 - 10
of 350
pro vyhledávání: '"Paganin, D."'
Signal-to-noise ratio and spatial resolution are quantitatively analysed in the context of in-line (propagation based) X-ray phase-contrast imaging. It is known that free-space propagation of a coherent X-ray beam from the imaged object to the detect
Externí odkaz:
http://arxiv.org/abs/2312.11506
X-ray diffusive dark-field imaging, which allows spatially unresolved microstructure to be mapped across a sample, is an increasingly popular tool in an array of settings. Here, we present a new algorithm for phase and dark-field computed tomography
Externí odkaz:
http://arxiv.org/abs/2310.09496
Publikováno v:
IEEE Transactions on Medical Imaging 42, 1681-1695 (2023)
Emerging methods of x-ray imaging that capture phase and dark-field effects are equipping medicine with complementary sensitivity to conventional radiography. These methods are being applied over a wide range of scales, from virtual histology to clin
Externí odkaz:
http://arxiv.org/abs/2112.10999
Diffuse two-dimensional integer-valued arrays are demonstrated that have delta-like aperiodic autocorrelation and, simultaneously, the array sums form delta-like projections along several directions. The delta-projected views show a single sharp spik
Externí odkaz:
http://arxiv.org/abs/2111.06568
Autor:
Mawson, T., Taplin, D. J., Brown, H. G., Clark, L., Ishikawa, R., Seki, T., Ikuhara, Y., Shibata, N., Paganin, D. M., Morgan, M. J., Weyland, M., Petersen, T. C., Findlay, S. D.
Publikováno v:
Ultramicroscopy 233 (2022) 113457
Quantitative differential phase contrast imaging of materials in atomic-resolution scanning transmission electron microscopy using segmented detectors is limited by various factors, including coherent and incoherent aberrations, detector positioning
Externí odkaz:
http://arxiv.org/abs/2108.08936
A canonical Huffman sequence is characterized by a zero inner-product between itself and each of its shifted copies, except at their largest relative shifts: their aperiodic auto-correlation then becomes delta-like, a single central peak surrounded b
Externí odkaz:
http://arxiv.org/abs/2106.02269
Publikováno v:
Ultramicroscopy Volume 230, 113311 (2021)
It has been argued that in atomic-resolution transmission electron microscopy (TEM) of sparse weakly scattering structures, such as small biological molecules, multiple electron scattering usually has only a small effect, while the in-molecule Fresne
Externí odkaz:
http://arxiv.org/abs/2012.07012
Autor:
Gureyev, T. E., Paganin, D. M., Arhatari, B., Taba, S. T., Lewis, S., Brennan, P. C., Quiney, H. M.
Publikováno v:
Physics in Medicine & Biology 65 215029 (2020)
A method for extracting the dark-field signal in propagation-based phase-contrast imaging is proposed. In the case of objects consisting predominantly of a single material, or several different materials with similar ratios of the real decrement to t
Externí odkaz:
http://arxiv.org/abs/2003.12248
Autor:
Mawson, T., Nakamura, A., Petersen, T. C., Shibata, N., Sasaki, H., Paganin, D. M., Morgan, M. J., Findlay, S. D.
In differential phase contrast scanning transmission electron microscopy (DPC-STEM), variability in dynamical diffraction resulting from changes in sample thickness and local crystal orientation (due to sample bending) can produce contrast comparable
Externí odkaz:
http://arxiv.org/abs/2002.01595
Publikováno v:
IEEE Transactions on Computational Imaging, vol. 6, pp. 1258-1271 (2020)
Discrete delta functions define the limits of attainable spatial resolution for all imaging systems. Here we construct broad, multi-dimensional discrete functions that replicate closely the action of a Dirac delta function under aperiodic convolution
Externí odkaz:
http://arxiv.org/abs/1910.13823