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Multilevel approximations in sample-based inversion from the Dirichlet-to-Neumann map

J D Moulton et al 2008 J. Phys.: Conf. Ser. 124 012035 (10pp)   doi: 10.1088/1742-6596/124/1/012035  Help

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J D Moulton1, C Fox2 and D Svyatskiy1
1 Mathematical Modeling and Analysis, MS B284, Los Alamos National Laboratory, Los Alamos, NM 87544
2 Department of Physics, University of Otago, Dunedin, New Zealand
E-mail: moulton@lanl.gov.fox@physics.otago.ac.nz.dasvyat@lanl.gov

Abstract. In 2005, Christen and Fox introduced a delayed acceptance Metropolis-Hastings (DAMH) algorithm that improved computational efficiency in sample-based imaging of electrical conductivity (EIT). That work used a linear approximation to the forward map in the first step of the algorithm. In this paper, we develop an alternative approximation for use in DAMH, namely a multilevel approximation developed from the hierarchy of coarse-scale models obtained by variational coarsening. This approach builds on two important strengths of robust multigrid solvers. First, the cost of a fine-scale solution of the forward map scales linearly with the degrees of freedom, and hence, it is provides better efficiency for algorithms performing sample-based inference. Second, the homogenization implicit in robust variational multigrid methods gives better solutions at coarse scales than homogenization by averaging of coefficients. We report results from a stylized example in electrical impedance imaging where data is a noisy and incomplete measurement of the Dirichlet-to-Neumann map.

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