Variational Bayesian inversion for microwave breast imaging

Leila Gharsalli 1 Hacheme Ayasso 2 Bernard Duchêne 1 Ali Mohammad-Djafari 1
1 L2S - Laboratoire des signaux et systèmes
2 GIPSA-CICS - CICS
GIPSA-DIS - Département Images et Signal
Abstract : Microwave imaging is considered as a nonlinear inverse scattering problem and tackled in a Bayesian estimation framework. The object under test (a breast affected by a tumor) is assumed to be composed of compact regions made of a restricted number of different homogeneous materials. This a priori knowledge is defined by a Gauss-Markov-Potts distribution. First, we express the joint posterior of all the unknowns; then, we present in detail the variational Bayesian approximation used to compute the estimators and reconstruct both permittivity and conductivity maps. This approximation consists of the best separable probability law that approximates the true posterior distribution in the Kullback-Leibler sense. This leads to an implicit parametric optimization scheme which is solved iteratively. Some preliminary results, obtained by applying the proposed method to synthetic data, are presented and compared with those obtained by means of the classical contrast source inversion method.
Keywords : variational Bayesian approximation inverse scattering microwave imaging breast cancer detection Gauss-Markov-Potts prior
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Article dans une revue
Computer Assisted Methods in Engineering and Science, Polish Academy of Sciences, 2014, 21 (3/4), pp.199-210
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Leila Gharsalli, Hacheme Ayasso, Bernard Duchêne, Ali Mohammad-Djafari. Variational Bayesian inversion for microwave breast imaging. Computer Assisted Methods in Engineering and Science, Polish Academy of Sciences, 2014, 21 (3/4), pp.199-210. 〈hal-01211734〉

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