Variational solution to the joint detection estimation of brain activity in fMRI

Lotfi Chaari 1 Florence Forbes 1 Thomas Vincent 2 Michel Dojat 3, * Philippe Ciuciu 2
* Auteur correspondant
1 MISTIS - Modelling and Inference of Complex and Structured Stochastic Systems
Inria Grenoble - Rhône-Alpes, LJK - Laboratoire Jean Kuntzmann, INPG - Institut National Polytechnique de Grenoble
2 LNAO - Laboratoire de Neuroimagerie Assistée par Ordinateur
3 ANTE-INSERM U836, équipe 5 - Neuro-imagerie fonctionnelle et métabolique
GIN - Grenoble Institut des Neurosciences
Abstract : We address the issue of jointly detecting brain activity and estimating underlying brain hemodynamics from functional MRI data. We adopt the so-called Joint Detection Estimation (JDE) framework that takes spatial dependencies between voxels into account. We recast the JDE into a missing data framework and derive a Variational Expectation-Maximization (VEM) algorithm for its inference. It follows a new algorithm that has interesting advantages over the previously used intensive simulation methods (Markov Chain Monte Carlo, MCMC): tests on artificial data show that the VEM-JDE is more robust to model mis-specification while additional tests on real data confirm that it achieves similar performance in much less computation time.
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Communication dans un congrès
Gabor Fichtinger, Anne Martel, and Terry Peters. MICCAI 2011 - 14th International Conference on Medical Image Computing and Computer-Assisted Intervention, Sep 2011, Toronto, Canada. Springer, 6892 (Pt 2), pp.260-268, 2011, Lecture Notes in Computer Science. 〈10.1007/978-3-642-23629-7_32〉
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Soumis le : mardi 25 octobre 2011 - 11:07:37
Dernière modification le : mercredi 11 avril 2018 - 01:59:47
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Lotfi Chaari, Florence Forbes, Thomas Vincent, Michel Dojat, Philippe Ciuciu. Variational solution to the joint detection estimation of brain activity in fMRI. Gabor Fichtinger, Anne Martel, and Terry Peters. MICCAI 2011 - 14th International Conference on Medical Image Computing and Computer-Assisted Intervention, Sep 2011, Toronto, Canada. Springer, 6892 (Pt 2), pp.260-268, 2011, Lecture Notes in Computer Science. 〈10.1007/978-3-642-23629-7_32〉. 〈inserm-00635384〉

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