Quantitative magnetization transfer of white matter tracts correlates with diffusion tensor imaging indices in predicting the conversion from mild cognitive impairment to Alzheimer's disease

Makovac, Elena, Serra, Laura, Di Domenico, Carlotta, Marra, Camillo, Caltagirone, Carlo, Cercignani, Mara and Bozzali, Marco (2018) Quantitative magnetization transfer of white matter tracts correlates with diffusion tensor imaging indices in predicting the conversion from mild cognitive impairment to Alzheimer's disease. Journal of Alzheimer's disease : JAD, 63 (2). pp. 561-575. ISSN 1875-8908

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Abstract

Patients with amnestic mild cognitive impairment (aMCI) have higher probability to develop Alzheimer's disease (AD) than elderly controls. The detection of subtle changes in brain structure associated with disease progression and the development of tools to identify patients at high risk for dementia in a short time is crucial. Here, we used probabilistic white matter (WM) tractography to explore microstructural alterations within the main association, limbic, and commissural pathways in aMCI patients who converted to AD after 1 year follow-up (MCIconverters) and those who remained stable (MCIstable). Both diffusion tensor imaging (DTI) and quantitative magnetization transfer (qMT) parameters have been considered for a comprehensive pathophysiological characterization of the WM damage. Overall, tract-specific parameters derived from qMT and DTI at baseline were able to differentiate aMCI patients who converted to AD from those who remained stable in time. In particular, the qMT exchange rate, RMB0, of the right uncinate fasciculus was significantly decreased in MCIconverters, whereas fractional anisotropy was significantly decreased in the bilateral superior cingulum in MCIconverters compared to MCIstable. These results confirm the involvement of WM and particularly of association fibers in the progression of AD, highlighting disconnection as a potential mechanism.

Item Type: Article
Keywords: Mild cognitive impairment, quantitative magnetization transfer, diffusion tensor imaging, white matter, probabilistic tractography
Schools and Departments: Brighton and Sussex Medical School > Neuroscience
Research Centres and Groups: Sackler Centre for Consciousness Science
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry > RC0346 Neurology. Diseases of the nervous system Including speech disorders
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Depositing User: Patricia Butler
Date Deposited: 09 Jul 2018 10:02
Last Modified: 09 Jul 2018 10:02
URI: http://srodev.sussex.ac.uk/id/eprint/75730

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