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Inclusion of coherence in Monte Carlo models for simulation of x-ray phase contrast imaging

Cipiccia, S; Vittoria, FA; Weikum, M; Olivo, A; Jaroszynski, DA; (2014) Inclusion of coherence in Monte Carlo models for simulation of x-ray phase contrast imaging. Optics Express , 22 (19) 23480 - 23488. 10.1364/OE.22.023480. Green open access

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Abstract

Interest in phase contrast imaging methods based on electromagnetic wave coherence has increased significantly recently, particularly at X-ray energies. This is giving rise to a demand for effective simulation methods. Coherent imaging approaches are usually based on wave optics, which require significant computational resources, particularly for producing 2D images. Monte Carlo (MC) methods, used to track individual particles/photons for particle physics, are not considered appropriate for describing coherence effects. Previous preliminary work has evaluated the possibility of incorporating coherence in Monte Carlo codes. However, in this paper, we present the implementation of refraction in a model that is based on time of flight calculations and the Huygens-Fresnel principle, which allow reproducing the formation of phase contrast images in partially and fully coherent experimental conditions. The model is implemented in the FLUKA Monte Carlo code and X-ray phase contrast imaging simulations are compared with experiments and wave optics calculations.

Type: Article
Title: Inclusion of coherence in Monte Carlo models for simulation of x-ray phase contrast imaging
Location: USA
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.22.023480
Publisher version: http://dx.doi.org/10.1364/OE.22.023480
Language: English
Additional information: This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.22.023480. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Keywords: general science
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1448709
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