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Proceedings Paper

Detection of local inhomogeneities in scattering media using tomographic reconstruction techniques
Author(s): Richard Freyer; Uwe Hampel; M. Forejtek; Cuong Tran Luu
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Paper Abstract

Investigations on photon migration in strongly scattering media have shown that due to the practical bandlimitation of the media's transfer characteristic a complete reconstruction of size, shape, and optical parameters of embedded inhomogeneities is generally impossible. However, using a priori information can considerably reduce the solution space. In this article we present a method to determine the position of an inhomogeneity in a cylindrical scattering object by backprojecting the changes in measurement value. For the backprojection a set of trajectories is used approximating the maximum probability photon path. Reconstruction methods as known from computed tomography (CT) are used to obtain a visually improved slice image giving the opportunity to estimate size and shape of the inhomogeneities. Although in this article the procedure is described for time-integrated measurements it should be applicable to any other measurement technique. Above all the method is computationally very efficient.

Paper Details

Date Published: 18 December 1995
PDF: 12 pages
Proc. SPIE 2626, Photon Propagation in Tissues, (18 December 1995); doi: 10.1117/12.228680
Show Author Affiliations
Richard Freyer, Technische Univ. Dresden (Germany)
Uwe Hampel, Technische Univ. Dresden (Germany)
M. Forejtek, Technische Univ. Dresden (Germany)
Cuong Tran Luu, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 2626:
Photon Propagation in Tissues
Britton Chance; David T. Delpy; Gerhard J. Mueller, Editor(s)

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