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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 28 — Oct. 1, 2003
  • pp: 5785–5792

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

Adam Liebert, Heidrun Wabnitz, Dirk Grosenick, Michael Möller, Rainer Macdonald, and Herbert Rinneberg  »View Author Affiliations


Applied Optics, Vol. 42, Issue 28, pp. 5785-5792 (2003)
http://dx.doi.org/10.1364/AO.42.005785


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Abstract

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.

© 2003 Optical Society of America

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

History
Original Manuscript: January 15, 2003
Revised Manuscript: June 25, 2003
Published: October 1, 2003

Citation
Adam Liebert, Heidrun Wabnitz, Dirk Grosenick, Michael Möller, Rainer Macdonald, and Herbert Rinneberg, "Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons," Appl. Opt. 42, 5785-5792 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-28-5785


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