Abstract
We construct image-driven, mechanism-based biomarkers for Alzheimer’s disease (AD). These markers are parameters and predictions of a biophysical model of misfolded tau propagation, which is calibrated using positron emission tomography (PET) data. An example of such a model is the widely used single-species Fisher-Kolmogorov model (FK). In this article, we reveal a qualitative inconsistency between tau observations and the FK model predictions: FK has a bias towards maintaining the maximum misfolded tau to region of the initial misfolding, which most clinicians and modelers consider it to be the entorhinal cortex (EC). To partially address this EC bias, we introduce a simplified Heterodimer Fisher-Kolmogorov model (HFK) that tracks the dynamics of both abnormal and normal tau. To construct both FK and HFK models, we use a coarse, graph-based representation where nodes represent brain regions and edges represent inter-region connectivity computed using white matter tractography. The model parameters comprise migration, proliferation and clearance rates, which are estimated using a derivative-based optimization algorithm. We compare tau progression predictions between the FK and HFK models and conduct experiments using PET from 45 AD subjects. The HFK model achieved an average of 3.94% less relative fitting error compared to the FK model. Qualitatively, FK model overestimates misfolded tau in EC while HFK does not.
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Wen, Z., Ghafouri, A., Biros, G. (2023). A Two-Species Model for Abnormal Tau Dynamics in Alzheimer’s Disease. In: Woo, J., et al. Medical Image Computing and Computer Assisted Intervention – MICCAI 2023 Workshops. MICCAI 2023. Lecture Notes in Computer Science, vol 14394. Springer, Cham. https://doi.org/10.1007/978-3-031-47425-5_7
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