Optical parameters of turbid materials and tissues as determined by laterally resolved reflectance measurements

Dieter Oelkrug; Manfred Brun; Peter Hubner; Hans-Joachim Egelhaaf

doi:10.1117/12.260831

6 December 1996 Optical parameters of turbid materials and tissues as determined by laterally resolved reflectance measurements

Dieter Oelkrug, Manfred Brun, Peter Hubner, Hans-Joachim Egelhaaf

Author Affiliations +

Proceedings Volume 2925, Photon Propagation in Tissues II; (1996) https://doi.org/10.1117/12.260831
Event: BiOS Europe '96, 1996, Vienna, Austria

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.

Citation Download Citation

Dieter Oelkrug, Manfred Brun, Peter Hubner, and Hans-Joachim Egelhaaf "Optical parameters of turbid materials and tissues as determined by laterally resolved reflectance measurements", Proc. SPIE 2925, Photon Propagation in Tissues II, (6 December 1996); https://doi.org/10.1117/12.260831

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available