Detection of local inhomogeneities in scattering media using tomographic reconstruction techniques

Richard Freyer; Uwe Hampel; M. Forejtek; Cuong Tran Luu

doi:10.1117/12.228680

18 December 1995 Detection of local inhomogeneities in scattering media using tomographic reconstruction techniques

Richard Freyer, Uwe Hampel, M. Forejtek, Cuong Tran Luu

Proceedings Volume 2626, Photon Propagation in Tissues; (1995) https://doi.org/10.1117/12.228680
Event: BiOS Europe '95, 1995, Barcelona, Spain

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.

Citation Download Citation

Richard Freyer, Uwe Hampel, M. Forejtek, and Cuong Tran Luu "Detection of local inhomogeneities in scattering media using tomographic reconstruction techniques", Proc. SPIE 2626, Photon Propagation in Tissues, (18 December 1995); https://doi.org/10.1117/12.228680

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