Improving detection of ischemic lesions at 3Tesla with optimized diffusion-weighted magnetic resonance imaging

Abstract : BACKGROUND AND PURPOSE: This study compared three different combinations of DWI parameters: three and six diffusion imaging directions (3dir and 6dir, respectively) using b=1000 or 2000s/mm(2) (b1000 or b2000, respectively) to improve detection of recent ischemic lesions at 3Tesla (3T). MATERIALS AND METHODS: A total of 47 consecutive patients underwent three DWI scans: 3dir b1000; 6dir b1000; and 6dir b2000. Qualitative visual analysis was performed by three readers based on evaluation of the number of lesions, presence of artifacts and diagnostic confidence. Interobserver agreement, sensitivity, specificity, and positive and negative predictive values were calculated. RESULTS: Forty-five lesions were detected by 3dir b1000, 52 by 6dir b1000 and 56 by 6dir b2000 in 30 patients. The additional lesions identified by 6dir b2000 were either small or located in the posterior fossa. Sensitivity with 6dir b2000 was significantly higher than with 3dir b1000 (98.1% vs 77.4%; P<0.05). CONCLUSION: At 3T, 6dir b2000 DWI detected more acute ischemic lesions than 3dir b1000, particularly small lesions and those located in the brain stem.
keyword : Stroke MRI Diffusion DWI
Type de document :
Article dans une revue
Journal de Neuroradiologie / Journal of Neuroradiology, Elsevier Masson, 2013, epub ahead of print. 〈10.1016/j.neurad.2013.04.003〉
Liste complète des métadonnées

http://www.hal.inserm.fr/inserm-00845255
Contributeur : Jean-Yves Gauvrit <>
Soumis le : mardi 16 juillet 2013 - 16:54:39
Dernière modification le : mercredi 16 mai 2018 - 11:24:04

Identifiants

Citation

Isabelle Ract, Jean-Christophe Ferré, Thomas Ronzière, Emmanuelle Leray, Béatrice Carsin-Nicol, et al.. Improving detection of ischemic lesions at 3Tesla with optimized diffusion-weighted magnetic resonance imaging. Journal de Neuroradiologie / Journal of Neuroradiology, Elsevier Masson, 2013, epub ahead of print. 〈10.1016/j.neurad.2013.04.003〉. 〈inserm-00845255〉

Partager

Métriques

Consultations de la notice

501