31 October 2016 Influence of incident light offset on diffuse reflectance measurement for curved object: a Monte Carlo-based study
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Abstract
Diffuse reflectance spectroscopy in the near-infrared (NIR) spectral ranges is a widely used technique for nondestructive inspection of biological tissues. The optical properties, such as absorption and scattering coefficients, can be inversely deduced from the measured quantities and then be used to speculate on some related chemical and physical properties of the tissue. Most studies consider biological tissues as homogeneous semi-infinite turbid media or infinitelywide planar layered turbid media. However, the biological tissues have various geometries, and nearly all of them have curved surfaces. The position and direction of the incident light relative to the tissue surface affect the diffuse reflectance. In this work, we study the influence of incident light offset on the measured diffuse reflectance signals based on the Monte Carlo (MC) simulation. The MC method are regarded as golden standard for light propagation in turbid media and can be used without the limitations of complex tissue geometries. A model for diffuse reflectance spectroscopy measurement using optic fiber probe is built. The incident light is assumed to be an infinitely narrow photon beam. The tissue under detection is assumed to be spherical described by its curvature radius. A series of Monte Carlo simulation are carried out with varying incident directions. Simulation results are analyzed and discussed to assess the influence on the measurements for tissues with different curvature radii. This study may aid in achieving more accurate and effective measurement without extensive experiments.
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Chizhu Ding, "Influence of incident light offset on diffuse reflectance measurement for curved object: a Monte Carlo-based study", Proc. SPIE 10024, Optics in Health Care and Biomedical Optics VII, 100241V (31 October 2016); doi: 10.1117/12.2244970; https://doi.org/10.1117/12.2244970
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