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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 10 — Apr. 1, 2005
  • pp: 1934–1941

Fluorescence spectra provide information on the depth of fluorescent lesions in tissue

Johannes Swartling, Jenny Svensson, Daniel Bengtsson, Khaled Terike, and Stefan Andersson-Engels  »View Author Affiliations


Applied Optics, Vol. 44, Issue 10, pp. 1934-1941 (2005)
http://dx.doi.org/10.1364/AO.44.001934


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Abstract

The fluorescence spectrum measured from a fluorophore in tissue is affected by the absorption and scattering properties of the tissue, as well as by the measurement geometry. We analyze this effect with Monte Carlo simulations and by measurements on phantoms. The spectral changes can be used to estimate the depth of a fluorescent lesion embedded in the tissue by measurement of the fluorescence signal in different wavelength bands. By taking the ratio between the signals at two wavelengths, we show that it is possible to determine the depth of the lesion. Simulations were performed and validated by measurements on a phantom in the wavelength range 815-930 nm. The depth of a fluorescing layer could be determined with 0.6-mm accuracy down to at least a depth of 10 mm. Monte Carlo simulations were also performed for different tissue types of various composition. The results indicate that depth estimation of a lesion should be possible with 2-3-mm accuracy, with no assumptions made about the optical properties, for a wide range of tissues.

© 2005 Optical Society of America

OCIS Codes
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.3880) Medical optics and biotechnology : Medical and biological imaging
(170.6280) Medical optics and biotechnology : Spectroscopy, fluorescence and luminescence
(170.7050) Medical optics and biotechnology : Turbid media

Citation
Johannes Swartling, Jenny Svensson, Daniel Bengtsson, Khaled Terike, and Stefan Andersson-Engels, "Fluorescence spectra provide information on the depth of fluorescent lesions in tissue," Appl. Opt. 44, 1934-1941 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-10-1934


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