2012 Special Issue: Identification of brain regions responsible for Alzheimer's disease using a Self-adaptive Resource Allocation Network

Authors:
B. S. Mahanand;S. Suresh;N. Sundararajan;M. Aswatha Kumar
Affiliations:
Department of Information Science and Engineering, Sri Jayachamarajendra College of Engineering, Mysore, India;School of Computer Engineering, Nanyang Technological University, Singapore;Department of Information Science and Engineering, Sri Jayachamarajendra College of Engineering, Mysore, India;Department of Information Science and Engineering, M S Ramaiah Institute of Technology, Bangalore, India
Venue:
Neural Networks
Year:
2012

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Abstract

In this paper, we present a novel approach for the identification of brain regions responsible for Alzheimer's disease using the Magnetic Resonance (MR) images. The approach incorporates the recently developed Self-adaptive Resource Allocation Network (SRAN) for Alzheimer's disease classification using voxel-based morphometric features of MR images. SRAN classifier uses a sequential learning algorithm, employing self-adaptive thresholds to select the appropriate training samples and discard redundant samples to prevent over-training. These selected training samples are then used to evolve the network architecture efficiently. Since, the number of features extracted from the MR images is large, a feature selection scheme (to reduce the number of features needed) using an Integer-Coded Genetic Algorithm (ICGA) in conjunction with the SRAN classifier (referred to here as the ICGA-SRAN classifier) have been developed. In this study, different healthy/Alzheimer's disease patient's MR images from the Open Access Series of Imaging Studies data set have been used for the performance evaluation of the proposed ICGA-SRAN classifier. We have also compared the results of the ICGA-SRAN classifier with the well-known Support Vector Machine (SVM) and Extreme Learning Machine (ELM) classifiers. The study results clearly show that the ICGA-SRAN classifier produces a better generalization performance with a smaller number of features, lower misclassification rate and a compact network. The ICGA-SRAN selected features clearly indicate that the variations in the gray matter volume in the parahippocampal gyrus and amygdala brain regions may be good indicators of the onset of Alzheimer's disease in normal persons.