Graph Theory and GNNs to Unravel the Topographical Organization of Brain Lesions in Variants of Alzheimer's Disease Progression

• URL: http://arxiv.org/abs/2403.00636v2
• Date: Fri, 5 Jul 2024 14:48:52 GMT
• Title: Graph Theory and GNNs to Unravel the Topographical Organization of Brain Lesions in Variants of Alzheimer's Disease Progression
• Authors: Gabriel Jimenez, Leopold Hebert-Stevens, Benoit Delatour, Lev Stimmer, Daniel Racoceanu,
• Abstract summary: We proposed and evaluated a graph-based framework to assess variations in Alzheimer's disease (AD) neuropathologies. Our framework focuses on classic (cAD) and rapid (rpAD) progression forms. Results suggest a unique neuropathological network organization for each AD variant.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this study, we proposed and evaluated a graph-based framework to assess variations in Alzheimer's disease (AD) neuropathologies, focusing on classic (cAD) and rapid (rpAD) progression forms. Histopathological images are converted into tau-pathology-based (i.e., amyloid plaques and tau tangles) graphs, and derived metrics are used in a machine-learning classifier. This classifier incorporates SHAP value explainability to differentiate between cAD and rpAD. Furthermore, we tested graph neural networks (GNNs) to extract topological embeddings from the graphs and use them in classifying the progression forms of AD. The analysis demonstrated denser networks in rpAD and a distinctive impact on brain cortical layers: rpAD predominantly affects middle layers, whereas cAD influences both superficial and deep layers of the same cortical regions. These results suggest a unique neuropathological network organization for each AD variant.

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