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Cortical surface mapping using topology correction, partial flattening and 3D shape context-based non-rigid registration for use in quantifying atrophy in Alzheimer's disease
Acosta, Oscar Fripp, Jurgen Dore, Vincent Bourgeat, Pierrick Favreau, Jean-Marie Chetelat, Gael Rueda, Andrea Villemagne, Victor L. Szoeke, Cassandra Ames, David
Acosta, Oscar
Fripp, Jurgen
Dore, Vincent
Bourgeat, Pierrick
Favreau, Jean-Marie
Chetelat, Gael
Rueda, Andrea
Villemagne, Victor L.
Szoeke, Cassandra
Ames, David
Author
Acosta, Oscar
Fripp, Jurgen
Dore, Vincent
Bourgeat, Pierrick
Favreau, Jean-Marie
Chetelat, Gael
Rueda, Andrea
Villemagne, Victor L.
Szoeke, Cassandra
Ames, David
Ellis, Kathryn A.
Martins, Ralph N.
Masters, Colin L.
Rowe, Christopher C.
Bonner, Erik
Gris, Florence
Xiao, Di
Raniga, Parnesh
Barra, Vincent
Salvado, Olivier
Fripp, Jurgen
Dore, Vincent
Bourgeat, Pierrick
Favreau, Jean-Marie
Chetelat, Gael
Rueda, Andrea
Villemagne, Victor L.
Szoeke, Cassandra
Ames, David
Ellis, Kathryn A.
Martins, Ralph N.
Masters, Colin L.
Rowe, Christopher C.
Bonner, Erik
Gris, Florence
Xiao, Di
Raniga, Parnesh
Barra, Vincent
Salvado, Olivier
Abstract
Magnetic resonance (MR) provides a non-invasive way to investigate changes in the brain resulting from aging or neurodegenerative disorders such as Alzheimer's disease (AD). Performing accurate analysis for population studies is challenging because of the interindividual anatomical variability. A large set of tools is found to perform studies of brain anatomy and population analysis (FreeSurfer, SPM, FSL). In this paper we present a newly developed surface-based processing pipeline (MILXCTE) that allows accurate vertex-wise statistical comparisons of brain modifications, such as cortical thickness (CTE). The brain is first segmented into the three main tissues: white matter, gray matter and cerebrospinal fluid, after CTE is computed, a topology corrected mesh is generated. Partial inflation and non-rigid registration of cortical surfaces to a common space using shape context are then performed. Each of the steps was firstly validated using MR images from the OASIS database. We then applied the pipeline to a sample of individuals randomly selected from the AIBL study on AD and compared with FreeSurfer. For a population of 50 individuals we found correlation of cortical thickness in all the regions of the brain (average r = 0.62 left and r = 0.64 right hemispheres). We finally computed changes in atrophy in 32 AD patients and 81 healthy elderly individuals. Significant differences were found in regions known to be affected in AD. We demonstrated the validity of the method for use in clinical studies which provides an alternative to well established techniques to compare different imaging biomarkers for the study of neurodegenerative diseases.
Keywords
cortical mapping, surface registration, partially inflated surfaces, cortical thickness, brain atrophy, shape context, statistical analysis of populations, Alzheimer's disease, freesurfer
Date
2012
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Journal article
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Journal of Neuroscience Methods
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