A parametric gradient descent MRI intensity inhomogeneity correction algorithm
Pattern Recognition Letters
Finite mixture of α-stable distributions
Digital Signal Processing
Bayesian mixture models of variable dimension for image segmentation
Computer Methods and Programs in Biomedicine
Editorial: Hybrid learning machines
Neurocomputing
A First Study on the Use of Coevolutionary Algorithms for Instance and Feature Selection
HAIS '09 Proceedings of the 4th International Conference on Hybrid Artificial Intelligence Systems
Editorial: Hybrid intelligent algorithms and applications
Information Sciences: an International Journal
Two fully-unsupervised methods for MR brain image segmentation using SOM-based strategies
Applied Soft Computing
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In this work, a segmentation method of Magnetic Resonance images (MRI) is presented. On the one hand, the distribution of the grey (GM) and white matter (WM) are modelled using a mixture of astable distributions. A Bayesian a-stable mixture model for histogram data is used and the unknown parameters are sampled using the Metropolis-Hastings algorithm, therefore, voxel intensity information is included in the model via a parameterized mixture of a-stable distribution which allows us to calculate the likelihood. On the other hand, spatial information is also included: the images are registered to a common template and a prior probability is given to each intensity value using a normalized segmented tissue probability map. Both informations, likelihood and prior values, are combined using the Bayes' Rule. Performance of the segmentation approaches using spatial prior information, intensity values via the likelihood and combining both using the Bayes' Rule are compared. Better segmentation results are obtained when the latter is used.