A Sparse and Spatially Constrained Generative Regression Model for fMRI Data Analysis (Journal article)
Oikonomou, V. P./ Blekas, K./ Astrakas, L.
In this study, we present an advanced Bayesian framework for the analysis of functional magnetic resonance imaging (fMRI) data that simultaneously employs both spatial and sparse properties. The basic building block of our method is the general linear regression model that constitutes a well-known probabilistic approach. By treating regression coefficients as random variables, we can apply an enhanced Gibbs distribution function that captures spatial constrains and at the same time allows sparse representation of fMRI time series. The proposed scheme is described as a maximum a posteriori approach, where the known expectation maximization algorithm is applied offering closed-form update equations for the model parameters. We have demonstrated that our method produces improved performance and functional activation detection capabilities in both simulated data and real applications.
|Institution and School/Department of submitter:||Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Ηλεκτρονικών Υπολογιστών και Πληροφορικής|
|Keywords:||expectation maximization (em) algorithm,functional magnetic resonance imaging (fmri) analysis,general linear regression model (glm),markov random field (mrf),relevance vector machine (rvm),time-series,bayesian-inference,linear-model,priors,algorithm,design,images,brain|
|Appears in Collections:||Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)|
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|blekas-2012-A Sparse and Spatially Constrained Generative.pdf||1.01 MB||Adobe PDF||View/Open Request a copy|
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