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Proceedings Paper

Time-reversal optical tomography: detecting and locating extended targets in a turbid medium
Author(s): Binlin Wu; W. Cai; M. Xu; S. K. Gayen
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Paper Abstract

Time Reversal Optical Tomography (TROT) is developed to locate extended target(s) in a highly scattering turbid medium, and estimate their optical strength and size. The approach uses Diffusion Approximation of Radiative Transfer Equation for light propagation along with Time Reversal (TR) Multiple Signal Classification (MUSIC) scheme for signal and noise subspaces for assessment of target location. A MUSIC pseudo spectrum is calculated using the eigenvectors of the TR matrix T, whose poles provide target locations. Based on the pseudo spectrum contours, retrieval of target size is modeled as an optimization problem, using a "local contour" method. The eigenvalues of T are related to optical strengths of targets. The efficacy of TROT to obtain location, size, and optical strength of one absorptive target, one scattering target, and two absorptive targets, all for different noise levels was tested using simulated data. Target locations were always accurately determined. Error in optical strength estimates was small even at 20% noise level. Target size and shape were more sensitive to noise. Results from simulated data demonstrate high potential for application of TROT in practical biomedical imaging applications.

Paper Details

Date Published: 29 February 2012
PDF: 5 pages
Proc. SPIE 8216, Multimodal Biomedical Imaging VII, 82160K (29 February 2012); doi: 10.1117/12.906799
Show Author Affiliations
Binlin Wu, The City Univ. of New York (United States)
W. Cai, The City Univ. of New York (United States)
M. Xu, Fairfield Univ. (United States)
S. K. Gayen, The City Univ. of New York (United States)

Published in SPIE Proceedings Vol. 8216:
Multimodal Biomedical Imaging VII
Fred S. Azar; Xavier Intes, Editor(s)

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