title: Studying ventricular abnormalities in mild cognitive impairment with hyperbolic Ricci flow and tensor-based morphometry.
abstract: Mild Cognitive Impairment (MCI) is a transitional stage between normal aging and dementia and people with MCI are at high risk of progression to dementia. MCI is attracting increasing attention, as it offers an opportunity to target the disease process during an early symptomatic stage. Structural magnetic resonance imaging (MRI) measures have been the mainstay of Alzheimer's disease (AD) imaging research, however, ventricular morphometry analysis remains challenging because of its complicated topological structure. Here we describe a novel ventricular morphometry system based on the hyperbolic Ricci flow method and tensor-based morphometry (TBM) statistics. Unlike prior ventricular surface parameterization methods, hyperbolic conformal parameterization is angle-preserving and does not have any singularities. Our system generates a one-to-one diffeomorphic mapping between ventricular surfaces with consistent boundary matching conditions. The TBM statistics encode a great deal of surface deformation information that could be inaccessible or overlooked by other methods. We applied our system to the baseline MRI scans of a set of MCI subjects from the Alzheimer's Disease Neuroimaging Initiative (ADNI: 71 MCI converters vs. 62 MCI stable). Although the combined ventricular area and volume features did not differ between the two groups, our fine-grained surface analysis revealed significant differences in the ventricular regions close to the temporal lobe and posterior cingulate, structures that are affected early in AD. Significant correlations were also detected between ventricular morphometry, neuropsychological measures, and a previously described imaging index based on fluorodeoxyglucose positron emission tomography (FDG-PET) scans. This novel ventricular morphometry method may offer a new and more sensitive approach to study preclinical and early symptomatic stage AD.
authors.affiliation: School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Shi
authors.affiliation: Department of Psychiatry and Psychology, Mayo Clinic Arizona, Scottsdale, AZ, USA.
authors.forename: Cynthia M
authors.initials: CM
authors.lastname: Stonnington
authors.affiliation: Imaging Genetics Center, Institute for Neuroimaging and Informatics, University of Southern California, Los Angeles, CA, USA.
authors.forename: Paul M
authors.initials: PM
authors.lastname: Thompson
authors.affiliation: Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA.
authors.forename: Kewei
authors.initials: K
authors.lastname: Chen
authors.affiliation: Imaging Genetics Center, Institute for Neuroimaging and Informatics, University of Southern California, Los Angeles, CA, USA.
authors.forename: Boris
authors.initials: B
authors.lastname: Gutman
authors.affiliation: Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA.
authors.forename: Cole
authors.initials: C
authors.lastname: Reschke
authors.affiliation: Human Brain Imaging Laboratory, Barrow Neurological Institute, Phoenix, AZ, USA.
authors.forename: Leslie C
authors.initials: LC
authors.lastname: Baxter
authors.affiliation: Banner Alzheimer's Institute and Banner Good Samaritan PET Center, Phoenix, AZ, USA.
authors.forename: Eric M
authors.initials: EM
authors.lastname: Reiman
authors.affiliation: Department of Neurology, Mayo Clinic Arizona, Scottsdale, AZ, USA.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Caselli
authors.affiliation: School of Computing, Informatics, and Decision Systems Engineering, Arizona State University, Tempe, AZ, USA. Electronic address: ylwang@asu.edu.
authors.forename: Yalin
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D000544:Alzheimer Disease / Q000473:pathology / Q000523:psychology; D002552:Cerebral Ventricles / Q000000981:diagnostic imaging / Q000473:pathology*; D060825:Cognitive Dysfunction / Q000000981:diagnostic imaging / Q000473:pathology* / Q000523:psychology; D056324:Diffusion Tensor Imaging; D005260:Female; D019788:Fluorodeoxyglucose F18; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008959:Models, Neurological; D009483:Neuropsychological Tests; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18
keywords: Alzheimer's disease; Hyperbolic Ricci flow; Mild cognitive impairment; Tensor-based morphometry