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Proceedings Paper

Measurement of optical-transport coefficients of Intralipid in visible and NIR range
Author(s): Yingtian Pan; Ralf Engelhardt; Juergen Rosperich-Palm; Gereon Huettmann; Reginald Birngruber
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Paper Abstract

This article presents a modified method of measuring the optical-transport-coefficients of intralipid: the diffuse reflectance of intralipid with added-ink Rdink is measured by using an integrating sphere to calculate the scattering coefficient (mu) 's, the effective attenuation coefficient (mu) eff is measured by scanning the surface of pure intralipid suspension with a cut-end, high NA fiber-optic tip ((phi) 600micrometers , NA equals 0.48) in order to directly derive the absorption (mu) a of pure intralipid. In the same way, their wavelength dependencies between 0.48 - 0.85 micrometers are measured by utilizing Ar+, dye and Ti:Sapphire lasers. Experiments show that (mu) s((lambda) ) varies with (lambda) according to the previously reported Mie theory, (mu) 's((lambda) ) decreases with (lambda) while Rdink((lambda) ) is nearly invariant within the wavelength range; the scattering anisotropy g((lambda) ) tends to decrease linearly with (lambda) from 0.91 to 0.78; (mu) a((lambda) ) first decreases with (lambda) till (lambda) approximately equals 0.61 micrometers and then gradually increases with (lambda) . In the Rdink experiments, it has been found that when the port of the integrating sphere is lifted above the liquid surface, the dependence of the measured intensity with the height H can be well-fitted into an exponential relation for H <EQ 3 cm and Lorentzian relation for H <EQ 10 cm, so Rdink can be accurately derived by a simple extrapolation over a few measured points to H equals 0. Monte-Carlo simulation is applied to analyze the results.

Paper Details

Date Published: 17 August 1994
PDF: 10 pages
Proc. SPIE 2134, Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards, (17 August 1994); doi: 10.1117/12.182954
Show Author Affiliations
Yingtian Pan, Medizinisches Laserzentrum Luebeck (Germany)
Ralf Engelhardt, Medizinisches Laserzentrum Luebeck (Germany)
Juergen Rosperich-Palm, Medizinisches Laserzentrum Luebeck (Germany)
Gereon Huettmann, Medizinisches Laserzentrum Luebeck (Germany)
Reginald Birngruber, Medizinisches Laserzentrum Luebeck (Germany)

Published in SPIE Proceedings Vol. 2134:
Laser-Tissue Interaction V; and Ultraviolet Radiation Hazards
Steven L. Jacques; David H. Sliney; Michael Belkin, Editor(s)

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