Independent component analysis of DTI data reveals white matter covariances in Alzheimer's disease

Xin Ouyang; Xiaoyu Sun; Ting Guo; Qiaoyue Sun; Kewei Chen; Li Yao; Xia Wu; Xiaojuan Guo

doi:10.1117/12.2042237

13 March 2014 Independent component analysis of DTI data reveals white matter covariances in Alzheimer's disease

Xin Ouyang, Xiaoyu Sun, Ting Guo, Qiaoyue Sun, Kewei Chen, Li Yao, Xia Wu, Xiaojuan Guo

Proceedings Volume 9038, Medical Imaging 2014: Biomedical Applications in Molecular, Structural, and Functional Imaging; 90380B (2014) https://doi.org/10.1117/12.2042237
Event: SPIE Medical Imaging, 2014, San Diego, California, United States

Abstract

Alzheimer’s disease (AD) is a progressive neurodegenerative disease with the clinical symptom of the continuous deterioration of cognitive and memory functions. Multiple diffusion tensor imaging (DTI) indices such as fractional anisotropy (FA) and mean diffusivity (MD) can successfully explain the white matter damages in AD patients. However, most studies focused on the univariate measures (voxel-based analysis) to examine the differences between AD patients and normal controls (NCs). In this investigation, we applied a multivariate independent component analysis (ICA) to investigate the white matter covariances based on FA measurement from DTI data in 35 AD patients and 45 NCs from the Alzheimer's Disease Neuroimaging Initiative (ADNI) database. We found that six independent components (ICs) showed significant FA reductions in white matter covariances in AD compared with NC, including the genu and splenium of corpus callosum (IC-1 and IC-2), middle temporal gyral of temporal lobe (IC-3), sub-gyral of frontal lobe (IC-4 and IC-5) and sub-gyral of parietal lobe (IC-6). Our findings revealed covariant white matter loss in AD patients and suggest that the unsupervised data-driven ICA method is effective to explore the changes of FA in AD. This study assists us in understanding the mechanism of white matter covariant reductions in the development of AD.

Citation Download Citation

Xin Ouyang, Xiaoyu Sun, Ting Guo, Qiaoyue Sun, Kewei Chen, Li Yao, Xia Wu, and Xiaojuan Guo "Independent component analysis of DTI data reveals white matter covariances in Alzheimer's disease", Proc. SPIE 9038, Medical Imaging 2014: Biomedical Applications in Molecular, Structural, and Functional Imaging, 90380B (13 March 2014); https://doi.org/10.1117/12.2042237

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