Zobrazeno 1 - 10
of 68
pro vyhledávání: '"Kieran G. Larkin"'
Publikováno v:
Signal Processing. 201:108702
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d21603fa5b59bfc769f4456bdad1e752
https://doi.org/10.1016/j.sigpro.2022.108702
https://doi.org/10.1016/j.sigpro.2022.108702
Publikováno v:
Physics in medicine and biology. 61(16)
Recent image guidance developments for preclinical synchrotron microbeam radiotherapy represent a necessary step for future clinical translation of the technique. Image quality can be further improved using x-ray phase contrast, which is readily avai
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::09e454ef7e89f92a4aac81b244e6fd05
https://pubmed.ncbi.nlm.nih.gov/27436750
https://pubmed.ncbi.nlm.nih.gov/27436750
Publikováno v:
Journal of Biomedical Optics. 22:016006
We describe the principles of using orientation-independent differential interference contrast (OI-DIC) microscopy for mapping optical path length (OPL). Computation of the scalar two-dimensional OPL map is based on an experimentally received map of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::427cd749f0f9a11f1c0616fc026df694
https://doi.org/10.1117/1.jbo.22.1.016006
https://doi.org/10.1117/1.jbo.22.1.016006
Autor:
Kieran G. Larkin, Colin J. R. Sheppard
Publikováno v:
Optik. 112:189-192
For paraxial wave-fields in two dimensions, it is known that the defocused OTF is given by a section through the ambiguity function. This is no longer true for high aperture fields. It is shown that there is a simple relationship, even for high apert
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6f236754868058acb1fb2c83c94641f7
https://doi.org/10.1078/0030-4026-00040
https://doi.org/10.1078/0030-4026-00040
Autor:
Kieran G. Larkin, Colin J. R. Sheppard
Publikováno v:
Optics Communications. 154:173-178
The significance of the similarity theorem for the fractional Fourier transform is discussed, and the properties of self-similar functions considered. The concept of the fractional Hankel transform is developed for use in the analysis of diffraction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ca8341b3daf0468b3f897cd8a8bb7c4
https://doi.org/10.1016/s0030-4018(98)00229-6
https://doi.org/10.1016/s0030-4018(98)00229-6
Publikováno v:
Optics Communications. 139:99-106
At present the best methods for rotation of discrete sampled images use a combination of (fast) Fourier interpolation followed by cubic interpolation onto a rotated grid. A method is presented which uses only Fourier interpolation. The new method has
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1a185dc4c7bb423c8fbb5916cfbe874d
https://doi.org/10.1016/s0030-4018(97)00097-7
https://doi.org/10.1016/s0030-4018(97)00097-7
Autor:
Peter Fletcher, Kieran G. Larkin
Publikováno v:
Biomedical optics express. 5(3)
X-ray Talbot moire interferometers can now simultaneously generate two differential phase images of a specimen. The conventional approach to integrating differential phase is unstable and often leads to images with loss of visible detail. We propose
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ecb9e1499fce94b5a92b6cdfa7df1e56
https://pubmed.ncbi.nlm.nih.gov/24688823
https://pubmed.ncbi.nlm.nih.gov/24688823
Autor:
Colin J. R. Sheppard, Kieran G. Larkin
Publikováno v:
Optik. 113:548-550
Summary In an imaging system, it is known that the information capacity, rather than the resolution, is invariant. Thus super-resolution can be achieved by encoding/decoding additional information on to independent parameters of the imaging system. T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::02925e627c9824a8629ff0be3dde7782
https://doi.org/10.1078/0030-4026-00219
https://doi.org/10.1078/0030-4026-00219
Autor:
Colin J. R. Sheppard, Kieran G. Larkin
Publikováno v:
Journal of Modern Optics. 41:1495-1505
For complete spherical concentration of light the maximum theoretically possible total energy density for a given power input can be, in principle, achieved by appropriate choice of polarization and angular amplitude variation. Illumination of a focu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::277b01e08a28f6b2340c4c79d4f890b8
https://doi.org/10.1080/09500349414551421
https://doi.org/10.1080/09500349414551421