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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 31 — Nov. 1, 1998
  • pp: 7447–7458

Influence of a Superficial Layer in the Quantitative Spectroscopic Study of Strongly Scattering Media

Maria Angela Franceschini, Sergio Fantini, L. Adelina Paunescu, John S. Maier, and Enrico Gratton  »View Author Affiliations


Applied Optics, Vol. 37, Issue 31, pp. 7447-7458 (1998)
http://dx.doi.org/10.1364/AO.37.007447


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Abstract

We have experimentally investigated the meaning of the effective optical absorption [μa(eff)] and the reduced scattering [μs(eff)] coefficients measured on the surfaces of two-layered turbid media, using the diffusion equation for homogeneous, semi-infinite media. We performed frequency-domain spectroscopy in a reflectance geometry, using source–detector distances in the range 1.5–4.5 cm. We measured 100 samples, each made of one layer (thickness in the range 0.08–1.6 cm) on top of one semi-infinite block. The optical properties of the samples were similar to those of soft tissues in the near infrared. We found that the measured effective optical coefficients are representative of the underlying block if the superficial layer is less than ~0.4 cm thick, whereas they are representative of the superficial layer if it is more than ~1.3 cm thick.

© 1998 Optical Society of America

OCIS Codes
(170.5280) Medical optics and biotechnology : Photon migration
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
(170.7050) Medical optics and biotechnology : Turbid media
(300.0300) Spectroscopy : Spectroscopy
(300.6340) Spectroscopy : Spectroscopy, infrared

Citation
Maria Angela Franceschini, Sergio Fantini, L. Adelina Paunescu, John S. Maier, and Enrico Gratton, "Influence of a Superficial Layer in the Quantitative Spectroscopic Study of Strongly Scattering Media," Appl. Opt. 37, 7447-7458 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-31-7447

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