Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Callum M. Macdonald"'
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-11 (2023)
Abstract We examine the inverse problem of retrieving sample refractive index information in the context of optical coherence tomography. Using two separate approaches, we discuss the limitations of the inverse problem which lead to it being ill-pose
Externí odkaz:
https://doaj.org/article/c27e70fa8d6c446c8c52cb53c5c498cc
Publikováno v:
Optical Elastography and Tissue Biomechanics X.
Publikováno v:
Journal of the Optical Society of America. A, Optics, image science, and vision. 39(5)
Finite-difference time-domain (FDTD) and pseudospectral time-domain (PSTD) methods are numerical electromagnetic simulation techniques that have been employed to perform rigorous simulations of broadband illuminations in several contexts. However, th
Autor:
Martyna Michalska, Alessandro Rossi, Gašper Kokot, Callum M. Macdonald, Silvia Cipiccia, Peter R.T. Munro, Alessandro Olivo, Ioannis Papakonstantinou
Diffractive optical elements such as periodic gratings are fundamental devices in X-ray imaging - a technique that medical, material science and security scans rely upon. Fabrication of such structures with high aspect ratios at the nanoscale creates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::920840f392c04fe54ab1de8ef32c6bfa
Autor:
Callum M, Macdonald, Susmita, Sridhar, Hung T X, Do, Javier, Luna-Labrador, Mouloud, Adel, Anabela, Da Silva
Publikováno v:
Biomed Opt Express
We investigate potential improvements of continuous-wave diffuse reflectance spectroscopy within highly scattering media by employing polarization gating. Simulations are used to show the extent at which the effective optical pathlength varies in a t
Autor:
Peter R. T. Munro, Callum M. Macdonald
Publikováno v:
Biomedical Optics Express
Full-wave models of OCT image formation, which are based on Maxwell’s equations, are highly realistic. However, such models incur a high computational cost, particularly when modelling sample volumes consistent with those encountered in practice. H
Autor:
Callum M. Macdonald, Peter R. T. Munro
Publikováno v:
Optical Coherence Tomography and Coherence Domain Optical Methods in Biomedicine XXIV.
Publikováno v:
Journal of Biomedical Optics
Indirect imaging problems in biomedical optics generally require repeated evaluation of forward models of radiative transport, for which Monte Carlo is accurate yet computationally costly. We develop a novel approach to reduce this bottleneck which h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ad62eb34335b3dec90591a25eafaf08
Publikováno v:
2019 IEEE Photonics Conference (IPC).
We explore the use of full-wave (Maxwell's Equations-based) forward and adjoint solvers to approach the inverse problem in Optical Coherence Tomography. We demonstrate that oscillatory artifacts in the electric susceptibility arise in the inversion p
Autor:
Peter R. T. Munro, Callum M. Macdonald
Publikováno v:
Optical Coherence Imaging Techniques and Imaging in Scattering Media III.
“Full-wave” models of OCT imaging systems based on Maxwell’s Equations are beginning to emerge as feasible alternatives to well established approximate models. These models are however computationally taxing when dealing with large samples. Her