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Proceedings Paper

High-speed simulation of skin spectral reflectance based on an optical path-length matrix method and its application
Author(s): Izumi Fujiwara; Satoshi Yamamoto; Midori Yamauchi; Keiko Ogawa-Ochiai; Toshiya Nakaguchi; Norimichi Tsumura
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Paper 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.

Paper Details

Date Published: 11 February 2011
PDF: 8 pages
Proc. SPIE 7907, Biomedical Applications of Light Scattering V, 79070K (11 February 2011); doi: 10.1117/12.873750
Show Author Affiliations
Izumi Fujiwara, Chiba Univ. (Japan)
Satoshi Yamamoto, Chiba Univ. (Japan)
Midori Yamauchi, Chiba Univ. (Japan)
Keiko Ogawa-Ochiai, Chiba Univ. Hospital (Japan)
Toshiya Nakaguchi, Chiba Univ. (Japan)
Norimichi Tsumura, Chiba Univ. (Japan)

Published in SPIE Proceedings Vol. 7907:
Biomedical Applications of Light Scattering V
Adam P. Wax; Vadim Backman, Editor(s)

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