High-speed simulation of skin spectral reflectance based on an optical path-length matrix method and its application

Izumi Fujiwara; Satoshi Yamamoto; Midori Yamauchi; Keiko Ogawa-Ochiai; Toshiya Nakaguchi; Norimichi Tsumura

doi:10.1117/12.873750

11 February 2011 High-speed simulation of skin spectral reflectance based on an optical path-length matrix method and its application

Izumi Fujiwara, Satoshi Yamamoto, Midori Yamauchi, Keiko Ogawa-Ochiai, Toshiya Nakaguchi, Norimichi Tsumura

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Proceedings Volume 7907, Biomedical Applications of Light Scattering V; 79070K (2011) https://doi.org/10.1117/12.873750
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

In this paper, we propose optical path-length matrix method for high-speed simulation of photon migration in human skin. The optical path-length matrix is defined as the probability density distribution of optical pathlength in the skin. Generally, Monte Carlo simulation is used to simulate a skin reflectance, since it can simulate the reflectance accurately. However, it requires a huge computation time, thus this is not easily applicable in practical imaging system with large number of pixels. On the other hand, the proposed optical path-length matrix method achieves the simulation in shorter time. The skin model was assumed to be two-layered media of the epidermal and dermal layers. For obtaining the path-length matrix, photon migration in the model without any absorption was simulated only once by Monte Carlo simulation for each wavelength, and the probabilistic density histograms of the optical path-length at each layer were acquired and stored in the optical path-length matrix. Skin spectral reflectance for arbitrary absorption can be calculated easily by accumulating all combination of an element in the above pre-recomputed path-length matrix and absorption coefficient based on the Beer-Lambert law. Our proposed method was compared with the conventional Monte Carlo simulation. Computational time of the proposed method was approximately two minutes; while that of the conventional method was 15 hours. In addition, error margin of the proposed method was approximately less than 1.6%. This method would applied to skin spectral image analysis for skin chromophore quantification.

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Izumi Fujiwara, Satoshi Yamamoto, Midori Yamauchi, Keiko Ogawa-Ochiai, Toshiya Nakaguchi, and Norimichi Tsumura "High-speed simulation of skin spectral reflectance based on an optical path-length matrix method and its application", Proc. SPIE 7907, Biomedical Applications of Light Scattering V, 79070K (11 February 2011); https://doi.org/10.1117/12.873750

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KEYWORDS

Monte Carlo methods

Skin

Reflectivity

Tissue optics

Light scattering

Absorption

Scattering

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