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Applied Optics

Applied Optics


  • Vol. 44, Iss. 10 — Apr. 1, 2005
  • pp: 1889–1897

Three-dimensional localization and optical imaging of objects in turbid media with independent component analysis

M. Xu, M. Alrubaiee, S. K. Gayen, and R. R. Alfano  »View Author Affiliations

Applied Optics, Vol. 44, Issue 10, pp. 1889-1897 (2005)

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A new approach for optical imaging and localization of objects in turbid media that makes use of the independent component analysis (ICA) from information theory is demonstrated. Experimental arrangement realizes a multisource illumination of a turbid medium with embedded objects and a multidetector acquisition of transmitted light on the medium boundary. The resulting spatial diversity and multiple angular observations provide robust data for three-dimensional localization and characterization of absorbing and scattering inhomogeneities embedded in a turbid medium. ICA of the perturbations in the spatial intensity distribution on the medium boundary sorts out the embedded objects, and their locations are obtained from Green’s function analysis based on any appropriate light propagation model. Imaging experiments were carried out on two highly scattering samples of thickness approximately 50 times the transport mean-free path of the respective medium. One turbid medium had two embedded absorptive objects, and the other had four scattering objects. An independent component separation of the signal, in conjunction with diffusive photon migration theory, was used to locate the embedded inhomogeneities. In both cases, improved lateral and axial localizations of the objects over the result obtained by use of common photon migration reconstruction algorithms were achieved. The approach is applicable to different medium geometries, can be used with any suitable photon propagation model, and is amenable to near-real-time imaging applications.

© 2005 Optical Society of America

OCIS Codes
(100.3010) Image processing : Image reconstruction techniques
(100.3190) Image processing : Inverse problems
(170.3660) Medical optics and biotechnology : Light propagation in tissues
(170.5280) Medical optics and biotechnology : Photon migration
(170.7050) Medical optics and biotechnology : Turbid media

Original Manuscript: July 14, 2004
Revised Manuscript: November 24, 2004
Manuscript Accepted: December 5, 2004
Published: April 1, 2005

M. Xu, M. Alrubaiee, S. K. Gayen, and R. R. Alfano, "Three-dimensional localization and optical imaging of objects in turbid media with independent component analysis," Appl. Opt. 44, 1889-1897 (2005)

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