title: Comparison between skeleton-based and atlas-based approach in the assessment of corpus callosum damages in Mild Cognitive Impairment and Alzheimer Disease.
abstract: The damage of specific bundles in the brain white matter (WM) is currently assessed in Alzheimer Disease (AD) and amnestic Mild Cognitive Impairment (aMCI) by tractography based on diffusion tensor imaging (DTI) and the consequent evaluation of diffusion parameters in reconstructed tracts. Controversial results may be due to the use of different techniques. This work aims at comparing an atlas-based technique to compute fractional anisotropy (FA) in specific tracts with the voxelwise approach of Tract-Based Spatial Statistics (TBSS). FA was evaluated in 7 portions of the corpus callosum (CC) of 10 elderly healthy controls (HC), 10 aMCI and 10 mild AD patients with both approaches. Atlas-based tractography revealed concordant results with TBSS, displaying the same significant differences between AD and HC and no significant difference between aMCI and HC. However, as regards the AD to aMCI contrast only the atlas-based method was able to find significantly lowered FA in AD in frontal and parietal CC portions. This finding shows that a proper analysis which considers a higher number of voxels, not restricting the observation to the skeleton in the assessment of CC damages, could be useful for AD to aMCI differential diagnosis and prognosis.
authors.affiliation: Dipartimento di Bioingegneria, Politecnico di Milano, Milano, Italy. gpreti@dongnocchi.it
authors.forename: Maria Giulia
authors.initials: MG
authors.lastname: Preti
authors.forename: Maria Marcella
authors.initials: MM
authors.lastname: Laganà
authors.forename: Francesca
authors.initials: F
authors.lastname: Baglio
authors.forename: Ludovica
authors.initials: L
authors.lastname: Griffanti
authors.forename: Raffaello
authors.initials: R
authors.lastname: Nemni
authors.forename: Pietro
authors.initials: P
authors.lastname: Cecconi
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Baselli
mesh_terms: D000368:Aged; D000544:Alzheimer Disease / Q000473:pathology*; D016880:Anisotropy; D001842:Bone and Bones / Q000473:pathology*; D016022:Case-Control Studies; D060825:Cognitive Dysfunction / Q000473:pathology*; D003337:Corpus Callosum / Q000473:pathology*; D056324:Diffusion Tensor Imaging; D005260:Female; D006801:Humans; D008297:Male