Study of light propagation in Asian and Caucasian skins by means of the Boundary Element Method

Ansari, Mohammad Ali; Massudi, Reza

doi:10.1016/j.optlaseng.2009.04.006

Cited by 19 publications

(20 citation statements)

References 31 publications

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“…This depends on the skin pigmentation and thickness, (e.g. Anderson and Parrish, ; Ansari and Massudi, ) and on the position of the testes within the body cavity (i.e., close or far to the skin, which can itself be more or less translucent), thereby causing sperm abnormalities (Mehlis et al., ). This may explain why the number of melanophores in testes is positively correlated with the number of sperm in the three‐spined stickleback ( Gasterosteus aculeatus; Mehlis et al., ).…”

Section: Physiological Roles Of Internal Melaninmentioning

confidence: 99%

Evolutionary and biomedical consequences of internal melanins

Dubey

Roulin

2014

Pigment Cell Melanoma Res

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Summary The adaptive function of melanin located in the integument is well known. Although pigments are also deposited in various internal organs, their function is unclear. A review of the literature revealed that ‘internal melanin’ protects against parasites, pollutants, low temperature, oxidative stress, hypoxemia and UV light, and is involved in the development and function of organs. Importantly, several studies have shown that the amount of melanin deposited on the external body surface is correlated with the amount located inside the body. This finding raises the possibility that internal melanin plays more important physiological roles in dark than light‐colored individuals. Internal melanin and coloration may therefore not evolve independently. This further emphasizes the major role played by indirect selection in evolutionary processes.

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Section: Physiological Roles Of Internal Melaninmentioning

confidence: 99%

Evolutionary and biomedical consequences of internal melanins

Dubey

Roulin

2014

Pigment Cell Melanoma Res

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“…The diffuse equation, as an approximation of RTE, is widely used to study propagation of photons [8,9]. In general, there is not any analytical solution for diffuse equation.…”

Section: Introductionmentioning

confidence: 99%

“…In 2009, we have shown that diffuse equation can be solved by green function based boundary integral method (BIM). In this paper, the accuracy and precision of this numerical solution was compared with Monte Carlo and finite difference method [1,9].…”

Section: Introductionmentioning

confidence: 99%

Estimation of optical abnormalities in breast phantom by diffuse equation

Ansari

Mohajerani

2014

Optik

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“…In 2011 in Canada by (Fodor, Ullmann, & Elman, 2011) used several ways and technique to classify tissue optical properties based on a model of laser propagation in tissue. The models of light interaction with human skin, developed by the many computer program companies are mainly aimed at the simulation of skin optical properties, which are used to predict the injection dose and propagation of laser into the skin (Ansari & Massudi, 2009;Chen et al, 2007;Shirkavand, Sarkar, Hejazi, Ataie-Fashtami, & Alinaghizadeh, 2007;Star, Marijnissen, & Gemert, 1988). The Monte Carlo simulation of the skin to asses the ability of PDT treatment and dose injection to reach different layers of skin (Svanberg, Bendsoe, Axelsson, Andersson-Engels, & Svanberg, 2010).…”

Section: Introductionmentioning

confidence: 99%

Control Light Delivery in PDT by Taking Account the Optical Properties of Hair Density on the Skin Surface

Mustafa¹,

Jaafar²,

Ismail³

2011

MAS

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Information concerning energy deposition during laser therapy of skin is needed to comprehend and asses the results of clinical procedures in dermatology. The prupose of this study is to show an optical model that predicts infection dose for the skins in different hair density and which can be used to explore whether parameteres of hair on the skin surface, merited the bio optical sudies and phsician during irradiation. A skin optic study by the advanced system analysis program (ASAP) software represents the best way for improving investigation of light propagation into the skin. The ASAP technique of the skin modeling is the process of constructing optical objects, such as a set of skin layers and propagation of a laser beam, whose behavior or properties correspond in some way to a particular real-wold system. The results showed that, hair on the skin surface minimized dose injection of the skin target during the PDT procedure. The differences in penetrating injection dose for layers of skin between low and high hair densities after irradiation, for end epidermis layer at 0.098 mm in the skin region with high and low hair density are 832.1 mW.mm-3 and 853 mW.mm-3 respectively, but for skin without hair is mW.mm-3. Using this resutl, we found that the region of decreased light fluence rate that formed at the epidermis layer significantly reduces the power uptake in deep layers. Moreover, hair density on the skin surface precents light penetration into the deeper region. Therefore, if the hair parameters are ignored, a relatively significant effect of the dose rise occurs in a deeper area resulting great influence in depth of target

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Study of light propagation in Asian and Caucasian skins by means of the Boundary Element Method

Cited by 19 publications

References 31 publications

Evolutionary and biomedical consequences of internal melanins

Evolutionary and biomedical consequences of internal melanins

Estimation of optical abnormalities in breast phantom by diffuse equation

Control Light Delivery in PDT by Taking Account the Optical Properties of Hair Density on the Skin Surface

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