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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 3 — Feb. 1, 2010
  • pp: 2849–2857

Measurement of particle flux in a static matrix with suppressed influence of optical properties, using low coherence interferometry

Babu Varghese, Vinayakrishnan Rajan, Ton G Van Leeuwen, and Wiendelt Steenbergen  »View Author Affiliations


Optics Express, Vol. 18, Issue 3, pp. 2849-2857 (2010)
http://dx.doi.org/10.1364/OE.18.002849


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Abstract

Perfusion measurements using conventional laser Doppler techniques are affected by the variations in tissue optical properties. Differences in absorption and scattering will induce different path lengths and consequently will alter the probability that a Doppler shift will occur. In this study, the fraction of Doppler shifted photons and the Doppler broadening of a dynamic medium, are measured with a phase modulated low coherence Mach-Zehnder interferometer. Path length-resolved dynamic light scattering measurements are performed in various media having a constant concentration of dynamic particles inside a static matrix with different scattering properties and the results are compared with a conventional laser Doppler technique, with a simple model and with Monte Carlo simulations. We demonstrate that, for larger optical path lengths, the scattering coefficient of the static matrix in which the moving particles are embedded have a small to minimal effect on the measured fraction of Doppler shifted photons and on the measured average Doppler frequency of the Doppler shifted light. This approach has potential applications in measuring perfusion independent of the influence of optical properties in the static tissue matrix.

© 2010 OSA

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(170.3340) Medical optics and biotechnology : Laser Doppler velocimetry
(170.3890) Medical optics and biotechnology : Medical optics instrumentation
(170.4580) Medical optics and biotechnology : Optical diagnostics for medicine

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: October 20, 2009
Revised Manuscript: January 18, 2010
Manuscript Accepted: January 19, 2010
Published: January 27, 2010

Virtual Issues
Vol. 5, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Babu Varghese, Vinayakrishnan Rajan, Ton G Van Leeuwen, and Wiendelt Steenbergen, "Measurement of particle flux in a static matrix with suppressed influence of optical properties, using low coherence interferometry," Opt. Express 18, 2849-2857 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-3-2849


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