Abstract / truncated to 115 words (read the full abstract)

Resistivity distribution estimation, widely known as Electrical Impedance Tomography (EIT), is a non linear ill-posed inverse problem. However, the partial derivative equation ruling this experiment yields no analytical solution for arbitrary conductivity distribution. Thus, solving the forward problem requires an approximation. The Finite Element Method (FEM) provides us with a computationally cheap forward model which preserves the non linear image-data relation and also reveals sufficiently accurate for the inversion. Within the Bayesian approach, Markovian priors on the log-conductivity distribution are introduced for regularization. The neighborhood system is directly derived from the FEM triangular mesh structure. We first propose a maximum a posteriori (MAP) estimation with a Huber-Markov prior which favours smooth distributions while preserving locally ... toggle 8 keywords

electrical impedance tomography finite element method maximum a posteriori markov random field conjugate gradient bilinearity gibbs sampler importance sampling


Martin, Thierry
Laboratoire des signaux et systèmes
Publication Year
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April 21, 2009

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