Light source distribution and scattering phase function influence light transport in diffuse multi-layered media
Article dans une revue avec comité de lecture
Red and near-Infrared light is often used as a useful diagnostic and imaging probe for highly scattering media such as biological tissues, fruits and vegetables. Part of diﬀusively reﬂected light gives interesting information related to the tissue subsurface, whereas light recorded at further distances may probe deeper into the interrogated turbid tissues. However, modelling diﬀusive events occurring at short source-detector distances requires to consider both the distribution of the light sources and the scattering phase functions. In this report, a modiﬁed Monte Carlo model is used to compute light transport in curved and multi-layered tissue samples which are covered with a thin and highly diﬀusing tissue layer. Diﬀerent light source distributions (ballistic, diﬀuse or Lambertian) are tested with speciﬁc scattering phase functions (modiﬁed or not modiﬁed Henyey-Greenstein, Gegenbauer and Mie) to compute the amount of backscattered and transmitted light in apple and human skin structures. Comparisons between simulation results and experiments carried out with a multi-spectral imaging setup conﬁrm the soundness of the theoretical strategy and may explain the role of the skin on light transport in whole and half-cut apples. Other computational results show that a Lambertian source distribution combined with a Henyey-Greenstein phase function provides a higher photon density in the stratum corneum than in the upper dermis layer. Furthermore, it is also shown that the scattering phase function may aﬀect the shape and the magnitude of the Bidirectional Reﬂectance Distribution (BRDF) exhibited at the skin surface.
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Article dans une revue avec comité de lectureASKOURA, Mohamed Lamine; VAUDELLE, Fabrice; L'HUILLIER, Jean-Pierre (MDPI, 2016)This work aimed at high lighting the role played by the skin in the light propagation through the apple ﬂesh. A multispectral Visible-Near Infrared (Vis-NIR) steady-state imaging setup based on the use of four continuous ...
Article dans une revue avec comité de lectureASKOURA, Mohamed Lamine; VAUDELLE, Fabrice; L'HUILLIER, Jean-Pierre (MDPI, 2015)This paper reports on the quantiﬁcation of light transport in apple models using Monte Carlo simulations. To this end, apple was modeled as a two-layer spherical model including skin and ﬂesh bulk tissues. The optical ...
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Multispectral measurement of scattering-angular light distribution in apple skin and flesh samples Article dans une revue avec comité de lectureASKOURA, Mohamed Lamine; VAUDELLE, Fabrice; L'HUILLIER, Jean-Pierre (Optical Society of America, 2016)Knowledge of the optical properties of apple tissues such as skin and flesh is essential to better understand the light–tissue interaction process and to apply optical methods for apple quality inspection. This work aimed ...