Determination of the optical properties of turbid media by measurement of the spatially resolved reflectance

Marco Pilz; Alwin Kienle

doi:10.1117/12.728263

12 July 2007 Determination of the optical properties of turbid media by measurement of the spatially resolved reflectance

Marco Pilz, Alwin Kienle

Author Affiliations +

Proceedings Volume 6629, Diffuse Optical Imaging of Tissue; 66290I (2007) https://doi.org/10.1117/12.728263
Event: European Conferences on Biomedical Optics, 2007, Munich, Germany

Abstract

The absorption and reduced scattering coefficients determine the radial dependence of the diffuse reflectance that is due to a point source. A system consisting of a HeNe laser source and a CCD camera was built for making remote measurements of spatially resolved diffuse reflectance. First, liquid tissue phantoms were made of Lipovenös and trypan blue. To determine the optical properties of the tissue phantoms a program code was implemented convolving the pointspread function of the camera with the solution of the diffusion equation and fitting the result to the measured data. We found that the prediction of &mgr;a and &mgr;s' was accurate within ± 10 % and ± 4 %. To check these results also measurements with a multiple fiber-optic detector in contact with the phantom surface at varying distances from the source were accomplished. The intensity signal was measured with twelve low noise photodiodes. We found good agreement between both approaches.

Citation Download Citation

Marco Pilz and Alwin Kienle "Determination of the optical properties of turbid media by measurement of the spatially resolved reflectance", Proc. SPIE 6629, Diffuse Optical Imaging of Tissue, 66290I (12 July 2007); https://doi.org/10.1117/12.728263

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