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Theses

Reconnaissance automatique des sillons corticaux

Abstract : The determination of specic biomarkers of brain pathologies at population scale is extremely dicult because of the huge inter-individual variability of the sulco-gyral topography. This thesis addresses this issue by automatically identifying 125 sulcal structures and pairing them through individuals, thanks to a manually labeled database of 62 subjects. Relying on the sulcal roots theory, cortical folds are split into elementary segments to be labeled. In a rst time, the structural approach proposed earlier by Jean-François Mangin and Denis Rivière has been revisited to manage the increasing amount of morphometric features involved in the identication process. In a second time, this model has been fully reviewed in favor of a Bayesian framework based on localized information (positions or directions) previously neglected, thus allowing eective optimization schemes. In this context, data normalization is essential ; this issue has been considered through global or sulciwise local ane registration techniques, jointly to the sulcal identication. In order to introduce more structural informations, a Markovian model has been successfully introduced to reect the local neighbored cortical folds organization. Finally, the overall recognition rate has reached 86 % for each hemisphere. From now on, only atypical patterns or the most variable anatomical structures remain a real issue.
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https://tel.archives-ouvertes.fr/tel-00457072
Contributor : Ens Cachan Bibliothèque <>
Submitted on : Tuesday, February 16, 2010 - 3:32:16 PM
Last modification on : Thursday, July 2, 2020 - 5:17:18 PM
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  • HAL Id : tel-00457072, version 1

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Matthieu Perrot. Reconnaissance automatique des sillons corticaux. Mathématiques [math]. École normale supérieure de Cachan - ENS Cachan, 2009. Français. ⟨tel-00457072⟩

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