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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 34 — Dec. 1, 2000
  • pp: 6498–6507

Broadband absorption spectroscopy in turbid media by combined frequency-domain and steady-state methods

Frédéric Bevilacqua, Andrew J. Berger, Albert E. Cerussi, Dorota Jakubowski, and Bruce J. Tromberg  »View Author Affiliations


Applied Optics, Vol. 39, Issue 34, pp. 6498-6507 (2000)
http://dx.doi.org/10.1364/AO.39.006498


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Abstract

A technique for measuring broadband near-infrared absorption spectra of turbid media that uses a combination of frequency-domain (FD) and steady-state (SS) reflectance methods is presented. Most of the wavelength coverage is provided by a white-light SS measurement, whereas the FD data are acquired at a few selected wavelengths. Coefficients of absorption (μ a ) and reduced scattering (μs) derived from the FD data are used to calibrate the intensity of the SS measurements and to estimate μs at all wavelengths in the spectral window of interest. After these steps are performed, one can determine μ a by comparing the SS reflectance values with the predictions of diffusion theory, wavelength by wavelength. Absorption spectra of a turbid phantom and of human breast tissue in vivo, derived with the combined SSFD technique, agree well with expected reference values. All measurements can be performed at a single source–detector separation distance, reducing the variations in sampling volume that exist in multidistance methods. The technique uses relatively inexpensive light sources and detectors and is easily implemented on an existing multiwavelength FD system.

© 2000 Optical Society of America

OCIS Codes
(170.1470) Medical optics and biotechnology : Blood or tissue constituent monitoring
(170.4090) Medical optics and biotechnology : Modulation techniques
(170.5280) Medical optics and biotechnology : Photon migration
(170.7050) Medical optics and biotechnology : Turbid media

History
Original Manuscript: April 26, 2000
Revised Manuscript: August 18, 2000
Published: December 1, 2000

Citation
Frédéric Bevilacqua, Andrew J. Berger, Albert E. Cerussi, Dorota Jakubowski, and Bruce J. Tromberg, "Broadband absorption spectroscopy in turbid media by combined frequency-domain and steady-state methods," Appl. Opt. 39, 6498-6507 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-34-6498

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