Poster électronique

Volumétrie des anévrismes de l'aorte abdominale en tomodensitométrie avec ou sans contraste ou endoprothèse
F. Morin-Roy, C. Kauffmann, S. Hadjadj, O. Thomas, K. Habboubi, D. Yang, É. Therasse, G. Soulez - Montréal - Canada
Congrès 2011
Poster primé par le jury
Résumé
Objectifs
Comparer la reproductibilité des mesures volumétriques des anévrismes de l’aorte abdominale (AAA) en tomodensitométrie (TDM) grâce à un logiciel semi-automatique selon la présence ou non de contraste (C+/C-) et d’endoprothèse (Sg+/Sg-).
Matériels et méthodes
Les TDMs de 80 patients avec AAA furent divisés en 4 groupes ( C+Sg-, C+Sg+, C-Sg-,C-Sg+). Tous les TDMs furent segmentés deux fois par deux étudiants et par un expert. La reproductibilité, intra et inter-observateur, des volumes fut estimée par des coefficients de corrélation intra-classe(CCI) et la précision par les erreurs relatives entre les étudiants et l’expert.
Résultats
Tous les AAA furent segmentés avec succès. Les lignes centrales ont été calculées automatiquement pour 38 C+TDMs, et semi-automatiquement pour 2C+TDMs et 40C-TDMs. Les résultats préliminaires (58 patients) démontrent des volumes moyens d’AAA variant entre (165,8±84,1) et (167,9±84,2)ml selon les lecteurs. Les moyennes des erreurs relatives varient entre : (0,1±2,7)% et (1,4±1,6)% sur les C+TDMs, (0,3±2,3)% et (-1,2±2,7)% sur les C-TDMs. Les CCIs inter et intra-observateurs furent estimés à 0,99 pour toutes les segmentations.
Conclusion
Le logiciel permet de segmenter adéquatement et de manière reproductible et précise tous les AAA en tomodensitométrie, même en l’absence de contraste et en présence d’endoprothèse.
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