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Measurement of absorption and scattering spectra with oblique incidence reflectometry

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Abstract

Fiber optic oblique incidence reflectometry has been demonstrated to be a simple and accurate method for measuring the optical properties, μa. and μs′, of turbid media such as biological tissues [1,2]. After sampling the spatial distribution of diffuse reflectance obliquely incident light, we can a) measure the shift the center of diffise reflectance, which is proportional to the diffusion coefficient of the medium (D), and b) fit the distribution to a diffusion theory model determine the effective attenuation coefficient (μeff). μa and μs′ can be calculated directly from these two parameters. This paper presents preliminary results that show that both absorption and reduced scattering spectra can be deduced from multi-spectral measurements of the relative diffuse reflectance profile of white light obliquely incident on tissue phantoms.

© 1996 Optical Society of America

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