Department of Systems Design and Informatics, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka, Fukuoka 820-8502, Japan.
J Biomed Opt. 2013 Jun;18(6):61232. doi: 10.1117/1.JBO.18.6.061232.
The reflection and scattering properties of light incident on human skin covered with powder particles have been investigated. A three-layer skin structure with a pigmented area is modeled, and the propagation of light in the skin's layers and in a layer of particles near the skin's surface is simulated using the Monte Carlo method. Assuming that only single scattering of light occurs in the powder layer, the simulation results show that the reflection spectra of light from the skin change with the size of powder particles. The color difference between normal and discolored skin is found to decrease considerably when powder particles with a diameter of approximately 0.25 μm are present near the skin's surface. The effects of the medium surrounding the particles, and the influence of the distribution of particle size (polydispersity), are also examined. It is shown that a surrounding medium with a refractive index close to that of the skin substantially suppresses the extreme spectral changes caused by the powder particles covering the skin surface.
已经研究了覆盖有粉末颗粒的人体皮肤对光的反射和散射特性。建立了具有色素区域的三层皮肤结构模型，并使用蒙特卡罗方法模拟了光在皮肤各层和皮肤表面附近颗粒层中的传播。假设在粉末层中仅发生单次光散射，模拟结果表明，光从皮肤反射的光谱随粉末颗粒的大小而变化。当皮肤表面附近存在直径约为 0.25μm 的粉末颗粒时，正常皮肤和变色皮肤之间的色差发现明显减小。还检查了颗粒周围介质的影响以及颗粒尺寸分布（多分散性）的影响。结果表明，具有接近皮肤折射率的周围介质会大大抑制由覆盖皮肤表面的粉末颗粒引起的光谱极端变化。
