Aortic and mitral regurgitation: quantification using moving slice velocity mapping.

Détails

ID Serval
serval:BIB_94375417AEE9
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Aortic and mitral regurgitation: quantification using moving slice velocity mapping.
Périodique
Journal of Magnetic Resonance Imaging
Auteur(s)
Kozerke S., Schwitter J., Pedersen E.M., Boesiger P.
ISSN
1053-1807 (Print)
ISSN-L
1053-1807
Statut éditorial
Publié
Date de publication
2001
Volume
14
Numéro
2
Pages
106-112
Langue
anglais
Résumé
Comprehensive assessment of the severity of valvular insufficiency includes quantification of regurgitant volumes. Previous methods lack reliable slice positioning with respect to the valve and are prone to velocity offsets due to through-plane motion of the valvular plane of the heart. Recently, the moving slice velocity mapping technique was proposed. In this study, the technique was applied for quantification of mitral and aortic regurgitation. Time-efficient navigator-based respiratory artifact suppression was achieved by implementing a prospective k-space reordering scheme in conjunction with slice position correction. Twelve patients with aortic insufficiency and three patients with mitral insufficiency were studied. Aortic regurgitant volumes were calculated from diastolic velocities mapped with a moving slice 5 mm distal to the aortic valve annulus. Mitral regurgitant flow was indirectly assessed by measuring mitral inflow at the level of the mitral annulus and net aortic outflow. Regurgitant fractions, derived from velocity data corrected for through-plane motion, were compared to data without correction for through-plane motion. In patients with mild and moderate aortic regurgitation, regurgitant fractions differed by 60% and 15%, on average, when comparing corrected and uncorrected data, respectively. Differences in severe aortic regurgitation were less (7%). Due to the large orifice area of the mitral valve, differences were still substantial in moderate-to-severe mitral regurgitation (19%). The moving slice velocity mapping technique was successfully applied in patients with aortic and mitral regurgitation. The importance of correction for valvular through-plane motion is demonstrated.
Mots-clé
Adult, Aortic Valve Insufficiency/diagnosis, Blood Flow Velocity, Female, Humans, Magnetic Resonance Imaging/methods, Male, Middle Aged, Mitral Valve Insufficiency/diagnosis
Pubmed
Web of science
Création de la notice
07/09/2011 18:52
Dernière modification de la notice
20/08/2019 15:56
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