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Titolo:
Effect of roughness in nondiffusive regions within diffusive media
Autore:
Ripoll, J; Nieto-Vesperinas, M; Arridge, SR;
Indirizzi:
CSIC, Inst Ciencia Mat Madrid, Madrid 28049, Spain CSIC Madrid Spain 28049 IC, Inst Ciencia Mat Madrid, Madrid 28049, Spain Univ Coll London, Dept Comp Sci, London WC1E 6BT, England Univ Coll London London England WC1E 6BT p Sci, London WC1E 6BT, England
Titolo Testata:
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
fascicolo: 4, volume: 18, anno: 2001,
pagine: 940 - 947
SICI:
1084-7529(200104)18:4<940:EORINR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOTON-DENSITY WAVES; BOUNDARY-CONDITIONS; SCATTERING MEDIA; OPTICAL TOMOGRAPHY; NONSCATTERING REGIONS; IMAGE-RECONSTRUCTION; RADIATIVE-TRANSFER; LIGHT-PROPAGATION; TURBID MEDIA; EQUATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Ripoll, J CSIC, Inst Ciencia Mat Madrid, Campus Cantoblanco, Madrid 28049,Spain CSIC Campus Cantoblanco Madrid Spain 28049 Madrid 28049, Spain
Citazione:
J. Ripoll et al., "Effect of roughness in nondiffusive regions within diffusive media", J OPT SOC A, 18(4), 2001, pp. 940-947

Abstract

Recently it has been shown that clear regions within diffusive media can be accurately modeled within the diffusion approximation by means of a novelboundary condition [J. Opt. Sec. Am. A 17, 1671 (2000)] or by an approximation to it [Phys. Med. Biol. 41, 767 (1996); Med. Phys. 27, 252 (2000)]. This can be directly applied to the study of light propagation in brain tissue, in which there exist clear regions, and in particular in the cerebrospinal fluid (CSF) layer under the skull. In this work we present the effect that roughness in the boundary of nondiffusive regions has on the measured average intensity, since, in practice, the CSF layer is quite rough. The sameconclusions can be extended to any diffusive medium that encloses rough nondiffusive regions. We will demonstrate with numerical calculations that the roughness statistics of the interfaces (although not their actual profiles) must be known a priori to correctly predict the shape of the average intensity. We show that as the roughness increases, the effect of the nondiffusive region diminishes until it disappears, thus yielding data similar to those of a fully diffusive region. We also present a numerical study of the diffuse light scattered in the presence of both diffusive and nondiffusive regions and the interaction between the two, showing that when the nondiffusive region is rough, the spatial-intensity distribution produced by the two regions can he very similar. (C) 2001 Optical Society of America.

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Documento generato il 23/01/20 alle ore 03:33:29