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Proceedings Paper

A new scheme for time-resolved diffusing wave spectroscopy
Author(s): Katarzyna Zarychta; Hà Liên Nghiêm; Monia Cheikh; Eric Tinet; Sigrid Avrillier; Jean-Michel Tualle
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Paper Abstract

Diffusing Wave Spectroscopy (DWS) consists in the measurement of temporal correlation of the electromagnetic field in the diffusion regime, allowing a scan of dynamical properties deep inside a medium. DWS is of special interest in biomedical optics, as it is sensitive to blood circulation in capillaries inside the tissue. However one main difficulty of this technique concerns data extraction which implies to perform an inverse problem taking into account the geometry and the optical coefficients of the medium. The use of time-resolved detection has been proved to be an efficient tool to discriminate the DWS information, but the photon path lengths were up to now limited to a few tens mean free paths. In order to perform time-resolved DWS for much longer photon paths, we used a new method, based on the use of an interferometer and a wavelength modulated source. We have already demonstrated that this method, in addition to its lower cost, was very efficient to perform time-resolved measurements of the light scattered by a thick scattering medium. We will show in this poster some measurements performed by transillumination through a thick medium (4cm), opening the possibility of Time-Resolved DWS measurements in the human breast.

Paper Details

Date Published: 15 September 2006
PDF: 5 pages
Proc. SPIE 6341, Speckle06: Speckles, From Grains to Flowers, 634132 (15 September 2006); doi: 10.1117/12.696004
Show Author Affiliations
Katarzyna Zarychta, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)
Hà Liên Nghiêm, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)
Monia Cheikh, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)
Eric Tinet, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)
Sigrid Avrillier, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)
Jean-Michel Tualle, Lab. de Physique des Lasers, CNRS, Univ. of Paris (France)


Published in SPIE Proceedings Vol. 6341:
Speckle06: Speckles, From Grains to Flowers
Pierre Slangen; Christine Cerruti, Editor(s)

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