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Applied Optics

Applied Optics


  • Vol. 38, Iss. 10 — Apr. 1, 1999
  • pp: 2097–2104

Evaluation of optical coherence quantitation of analytes in turbid media by use of two wavelengths

Ujwal S. Sathyam, Bill W. Colston, Jr., Luiz B. Da Silva, and Matthew J. Everett  »View Author Affiliations

Applied Optics, Vol. 38, Issue 10, pp. 2097-2104 (1999)

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We introduce a novel method for determining analyte concentration as a function of depth in a highly scattering media by use of a dual-wavelength optical coherence tomography system. We account for the effect of scattering on the measured attenuation by using a second wavelength that is not absorbed by the sample. We assess the applicability of this technique by measuring the concentration of water in an Intralipid phantom, using a probe wavelength of 1.53 µm and a reference wavelength of 1.31 µm. The results of our study show a strong correlation between the measured absorption and the water content of the sample. The accuracy of the technique, however, was limited by the dominance of scattering over absorption in the turbid media. Thus, although the effects of scattering were minimized, significant errors remained in the calculated absorption values. More-accurate results could be obtained with the use of more powerful superluminescent diodes and a choice of wavelengths at which absorption effects are more significant relative to scattering.

© 1999 Optical Society of America

OCIS Codes
(170.4500) Medical optics and biotechnology : Optical coherence tomography
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine
(170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics
(170.7050) Medical optics and biotechnology : Turbid media

Original Manuscript: July 7, 1998
Revised Manuscript: November 30, 1998
Published: April 1, 1999

Ujwal S. Sathyam, Bill W. Colston, Luiz B. Da Silva, and Matthew J. Everett, "Evaluation of optical coherence quantitation of analytes in turbid media by use of two wavelengths," Appl. Opt. 38, 2097-2104 (1999)

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