1. Recognition of Schizophrenia with Regularized Support Vector Machine and Sequential Region of Interest Selection using Structural Magnetic Resonance Imaging
- Author
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Rowena Chin, Alex Xiaobin You, Kang Sim, Fanwen Meng, and Juan Zhou
- Subjects
Adult ,Male ,Support Vector Machine ,Computer science ,Inferior frontal gyrus ,lcsh:Medicine ,computer.software_genre ,Left lateral ventricle ,Article ,Left thalamus ,03 medical and health sciences ,Superior temporal gyrus ,0302 clinical medicine ,Neuroimaging ,Region of interest ,Voxel ,medicine ,Image Processing, Computer-Assisted ,Middle frontal gyrus ,Humans ,Gray Matter ,lcsh:Science ,Multidisciplinary ,Fusiform gyrus ,business.industry ,lcsh:R ,Pattern recognition ,medicine.disease ,Magnetic Resonance Imaging ,030227 psychiatry ,Superior frontal gyrus ,nervous system ,Schizophrenia ,Case-Control Studies ,lcsh:Q ,Female ,Artificial intelligence ,business ,computer ,030217 neurology & neurosurgery ,Pars opercularis - Abstract
Structural brain abnormalities in schizophrenia have been well characterized with the application of univariate methods to magnetic resonance imaging (MRI) data. However, these traditional techniques lack sensitivity and predictive value at the individual level. Machine-learning approaches have emerged as potential diagnostic and prognostic tools. We used an anatomically and spatially regularized support vector machine (SVM) framework to categorize schizophrenia and healthy individuals based on whole-brain gray matter densities estimated using voxel-based morphometry from structural MRI scans. The regularized SVM model yielded recognition accuracy of 86.6% in the training set of 127 individuals and validation accuracy of 83.5% in an independent set of 85 individuals. A sequential region-of-interest (ROI) selection step was adopted for feature selection, improving recognition accuracy to 92.0% in the training set and 89.4% in the validation set. The combined model achieved 96.6% sensitivity and 74.1% specificity. Seven ROIs were identified as the optimal discriminatory subset: the occipital fusiform gyrus, middle frontal gyrus, pars opercularis of the inferior frontal gyrus, anterior superior temporal gyrus, superior frontal gyrus, left thalamus and left lateral ventricle. These findings demonstrate the utility of spatial and anatomical priors in SVM for neuroimaging analyses in conjunction with sequential ROI selection in the recognition of schizophrenia.
- Published
- 2018