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Med Phys. 2010 Nov;37(11):6084-95.

Feature selection using factor analysis for Alzheimer's diagnosis using 18F-FDG PET images.

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  • 1Department of Signal Theory, Networking and Communications, ETSIIT 18071, University of Granada, Granada, Spain. dsalas@ugr.es



This article presents a computer-aided diagnosis technique for improving the accuracy of the early diagnosis of Alzheimer's disease (AD). Two hundred and ten 18F-FDG PET images from the ADNI initiative [52 normal controls (NC), 114 mild cognitive impairment (MCI), and 53 AD subjects] are studied.


The proposed methodology is based on the selection of voxels of interest using the t-test and a posterior reduction of the feature dimension using factor analysis. Factor loadings are used as features for three different classifiers: Two multivariate Gaussian mixture model, with linear and quadratic discriminant function, and a support vector machine with linear kernel.


An accuracy rate up to 95% when NC and AD are considered and an accuracy rate up to 88% and 86% for NC-MCI and NC-MCI,AD, respectively, are obtained using SVM with linear kernel.


Results are compared to the voxel-as-features and a PCA- based approach and the proposed methodology achieves better classification performance.

[PubMed - indexed for MEDLINE]
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