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Proceedings Paper

Determination of the optical properties of turbid media by measurement of the spatially resolved reflectance
Author(s): Marco Pilz; Alwin Kienle
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Paper 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.

Paper Details

Date Published: 12 July 2007
PDF: 8 pages
Proc. SPIE 6629, Diffuse Optical Imaging of Tissue, 66290I (12 July 2007); doi: 10.1117/12.728263
Show Author Affiliations
Marco Pilz, Institut für Lasertechnologien in der Medizin und Meßtechnik (Germany)
Alwin Kienle, Institut für Lasertechnologien in der Medizin und Meßtechnik (Germany)


Published in SPIE Proceedings Vol. 6629:
Diffuse Optical Imaging of Tissue
Brian W. Pogue; Rinaldo Cubeddu, Editor(s)

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