Global tractography with embedded anatomical priors for quantitative connectivity analysis.

Détails

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Etat: Public
Version: de l'auteur⸱e
ID Serval
serval:BIB_9623F69AFC6D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Global tractography with embedded anatomical priors for quantitative connectivity analysis.
Périodique
Frontiers In Neurology
Auteur⸱e⸱s
Lemkaddem A., Skiöldebrand D., Dal Palú A., Thiran J.P., Daducci A.
ISSN
1664-2295 (Electronic)
ISSN-L
1664-2295
Statut éditorial
Publié
Date de publication
2014
Peer-reviewed
Oui
Volume
5
Pages
232
Langue
anglais
Notes
Publication types: Journal Article
Résumé
Tractography algorithms provide us with the ability to non-invasively reconstruct fiber pathways in the white matter (WM) by exploiting the directional information described with diffusion magnetic resonance. These methods could be divided into two major classes, local and global. Local methods reconstruct each fiber tract iteratively by considering only directional information at the voxel level and its neighborhood. Global methods, on the other hand, reconstruct all the fiber tracts of the whole brain simultaneously by solving a global energy minimization problem. The latter have shown improvements compared to previous techniques but these algorithms still suffer from an important shortcoming that is crucial in the context of brain connectivity analyses. As no anatomical priors are usually considered during the reconstruction process, the recovered fiber tracts are not guaranteed to connect cortical regions and, as a matter of fact, most of them stop prematurely in the WM; this violates important properties of neural connections, which are known to originate in the gray matter (GM) and develop in the WM. Hence, this shortcoming poses serious limitations for the use of these techniques for the assessment of the structural connectivity between brain regions and, de facto, it can potentially bias any subsequent analysis. Moreover, the estimated tracts are not quantitative, every fiber contributes with the same weight toward the predicted diffusion signal. In this work, we propose a novel approach for global tractography that is specifically designed for connectivity analysis applications which: (i) explicitly enforces anatomical priors of the tracts in the optimization and (ii) considers the effective contribution of each of them, i.e., volume, to the acquired diffusion magnetic resonance imaging (MRI) image. We evaluated our approach on both a realistic diffusion MRI phantom and in vivo data, and also compared its performance to existing tractography algorithms.
Pubmed
Web of science
Open Access
Oui
Création de la notice
15/12/2014 15:04
Dernière modification de la notice
20/08/2019 15:58
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