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Gray matter concentration and effective connectivity changes in Alzheimer's disease: a longitudinal structural MRI study.

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Li, Xingfeng, Coyle, Damien, Maguire, LP, Watson, David R and McGinnity, TM (2010) Gray matter concentration and effective connectivity changes in Alzheimer's disease: a longitudinal structural MRI study. IEEE, 15 pp, DOI: 10.1007/s00234-010-0795-1 [Internet publication]

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URL: https://springerlink3.metapress.com/content/h19568r228221469/resource-secured/?target=fulltext.pdf&sid=ydfkcn3s5ei3vjqaqd4vco45&sh=www.springerlink.com

DOI: 10.1007/s00234-010-0795-1

Abstract

INTRODUCTION: Understanding disease progression in Alzheimer's disease (AD) awaits the resolution of three fundamental questions: first, can we identify the location of "seed" regions where neuropathology is first present? Some studies have suggested the medial temporal lobe while others have suggested the hippocampus. Second, are there similar atrophy rates within affected regions in AD? Third, is there evidence of causality relationships between different affected regions in AD progression? METHODS: To address these questions, we conducted a longitudinal MRI study to investigate the gray matter (GM) changes in AD progression. Abnormal brain regions were localized by a standard voxel-based morphometry method, and the absolute atrophy rate in these regions was calculated using a robust regression method. Primary foci of atrophy were identified in the hippocampus and middle temporal gyrus (MTG). A model based upon the Granger causality approach was developed to investigate the cause-effect relationship over time between these regions based on GM concentration. RESULTS: Results show that in the earlier stages of AD, primary pathological foci are in the hippocampus and entorhinal cortex. Subsequently, atrophy appears to subsume the MTG. CONCLUSION: The causality results show that there is in fact little difference between AD and age-matched healthy control in terms of hippocampus atrophy, but there are larger differences in MTG, suggesting that local pathology in MTG is the predominant progressive abnormality during intermediate stages of AD development.

Item Type:Internet publication
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Computing and Intelligent Systems
Research Institutes and Groups:Computer Science Research Institute
Computer Science Research Institute > Intelligent Systems Research Centre
ID Code:17406
Deposited By:Dr Damien Coyle
Deposited On:29 Mar 2011 14:24
Last Modified:04 May 2011 14:35

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