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Optical tomography reconstruction algorithm with the finite element method: An optimal approach with regularization tools

Published: 01 October 2013 Publication History

Abstract

Optical tomography is mathematically treated as a non-linear inverse problem where the optical properties of the probed medium are recovered through the minimization of the errors between the experimental measurements and their predictions with a numerical model at the locations of the detectors. According to the ill-posed behavior of the inverse problem, some regularization tools must be performed and the Tikhonov penalization type is the most commonly used in optical tomography applications. This paper introduces an optimized approach for optical tomography reconstruction with the finite element method. An integral form of the cost function is used to take into account the surfaces of the detectors and make the reconstruction compatible with all finite element formulations, continuous and discontinuous. Through a gradient-based algorithm where the adjoint method is used to compute the gradient of the cost function, an alternative inner product is employed for preconditioning the reconstruction algorithm. Moreover, appropriate re-parameterization of the optical properties is performed. These regularization strategies are compared with the classical Tikhonov penalization one. It is shown that both the re-parameterization and the use of the Sobolev cost function gradient are efficient for solving such an ill-posed inverse problem.

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Cited By

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  • (2018)Topology optimization of thermal fluid flows with an adjoint Lattice Boltzmann MethodJournal of Computational Physics10.1016/j.jcp.2018.03.040365:C(376-404)Online publication date: 15-Jul-2018
  • (2015)A wavelet multi-scale method for the inverse problem of diffuse optical tomographyJournal of Computational and Applied Mathematics10.1016/j.cam.2015.01.023289:C(267-281)Online publication date: 1-Dec-2015

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Information

Published In

cover image Journal of Computational Physics
Journal of Computational Physics  Volume 251, Issue
October, 2013
534 pages

Publisher

Academic Press Professional, Inc.

United States

Publication History

Published: 01 October 2013

Author Tags

  1. Adjoint method
  2. Finite element parameterization
  3. Gradient filtering
  4. Inverse problem
  5. Radiative transfer equation
  6. Regularization

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  • (2018)Topology optimization of thermal fluid flows with an adjoint Lattice Boltzmann MethodJournal of Computational Physics10.1016/j.jcp.2018.03.040365:C(376-404)Online publication date: 15-Jul-2018
  • (2015)A wavelet multi-scale method for the inverse problem of diffuse optical tomographyJournal of Computational and Applied Mathematics10.1016/j.cam.2015.01.023289:C(267-281)Online publication date: 1-Dec-2015

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