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Proceedings Paper

Optical parameters of turbid materials and tissues as determined by laterally resolved reflectance measurements
Author(s): Dieter Oelkrug; Manfred Brun; Peter Hubner; Hans-Joachim Egelhaaf
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Paper Abstract

Effective scattering coefficients in the range of (sigma) eff equals 20 - 5000 cm-1 and absorption coefficients of (kappa) equals 0 - 200 cm-1 of densely packed turbid materials are determined from the radial distribution of reflectivity R((rho) ) upon laser spot irradiation. A scanning reflectometer with micrometer resolution is presented for the experimental determination of R((rho) ). The experimental reflectance curves are fitted with analytical solutions of the equation of transfer, which to this end is expanded into a series of spherical harmonics, P1, P3, P4... Comparison with Monte-Carlo simulations shows that the first series member, P1, describes only the range far from the center of irradiation, while the whole P5-set fits the entire reflectance curve. Results are given for a series of powders and for porcine aorta. The anisotropy parameter of scattering of alumina powder is determined to g approximately equals 0.24 from the laterally resolved degree of polarization of light reflected from the vicinity of the incident laser spot.

Paper Details

Date Published: 6 December 1996
PDF: 10 pages
Proc. SPIE 2925, Photon Propagation in Tissues II, (6 December 1996); doi: 10.1117/12.260831
Show Author Affiliations
Dieter Oelkrug, Univ. of Tuebingen (Germany)
Manfred Brun, Univ. of Tuebingen (Germany)
Peter Hubner, Univ. of Tuebingen (Germany)
Hans-Joachim Egelhaaf, Univ. of Tuebingen (Germany)

Published in SPIE Proceedings Vol. 2925:
Photon Propagation in Tissues II
David A. Benaron; Britton Chance; Gerhard J. Mueller, Editor(s)

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