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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 2 — Jan. 22, 2007
  • pp: 486–500

Calibration of scattering and absorption properties of a liquid diffusive medium at NIR wavelengths. CW method

Fabrizio Martelli and Giovanni Zaccanti  »View Author Affiliations


Optics Express, Vol. 15, Issue 2, pp. 486-500 (2007)
http://dx.doi.org/10.1364/OE.15.000486


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Abstract

In spite of many progresses achieved both with theories and with experiments in studying light propagation through diffusive media, a reliable method for accurate measurements of the optical properties of diffusive media at NIR wavelengths is, in our opinion, still missing. It is therefore difficult to create a diffusive medium with well known optical properties to be used as a reference. In this paper we describe a method to calibrate the reduced scattering coefficient, μ́ s , of a liquid diffusive medium and the absorption coefficient, μa , of an absorbing medium with a standard error smaller than 2% both on μ́ s and on μa . The method is based on multidistance measurements of fluence into an infinite medium illuminated by a CW source. The optical properties are retrieved with simple inversion procedures (linear fits) exploiting the knowledge of the absorption coefficient of the liquid into which the diffuser and the absorber are dispersed. In this study Intralipid diluted in water has been used as diffusive medium and Indian ink as absorber. For a full characterization of these media measurements of collimated transmittance have also been carried out, from which the asymmetry factor of the scattering function of Intralipid and the single scattering albedo of Indian ink have been determined.

© 2007 Optical Society of America

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.5280) Medical optics and biotechnology : Photon migration
(170.7050) Medical optics and biotechnology : Turbid media

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: December 12, 2006
Revised Manuscript: January 11, 2007
Manuscript Accepted: January 13, 2007
Published: January 22, 2007

Virtual Issues
Vol. 2, Iss. 2 Virtual Journal for Biomedical Optics

Citation
Fabrizio Martelli and Giovanni Zaccanti, "Calibration of scattering and absorption properties of a liquid diffusive medium at NIR wavelengths. CW method," Opt. Express 15, 486-500 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-2-486


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