Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Aortic and mitral regurgitation: Quantification using moving slice velocity mapping
Autore:
Kozerke, S; Schwitter, J; Pedersen, EM; Boesiger, P;
Indirizzi:
Univ Zurich, Inst Biomed Engn, CH-8092 Zurich, Switzerland Univ Zurich Zurich Switzerland CH-8092 Engn, CH-8092 Zurich, Switzerland
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE IMAGING
fascicolo: 2, volume: 14, anno: 2001,
pagine: 106 - 112
SICI:
1053-1807(200108)14:2<106:AAMRQU>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTROL-VOLUME METHOD; FLOW MEASUREMENTS; AFTERLOAD MISMATCH; RESPIRATORY MOTION; MR; REDUCTION; HEART; VALVE;
Keywords:
aortic regurgitation; mitral regurgitation; moving slice velocity mapping; flow quantification; respiratory motion correction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Boesiger, P Univ Zurich, Inst Biomed Engn, Gloriastr 35, CH-8092 Zurich, Switzerland Univ Zurich Gloriastr 35 Zurich Switzerland CH-8092 itzerland
Citazione:
S. Kozerke et al., "Aortic and mitral regurgitation: Quantification using moving slice velocity mapping", J MAGN R I, 14(2), 2001, pp. 106-112

Abstract

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, thetechnique was applied for quantification of mitral and aortic regurgitation. Time-efficient navigator-based respiratory artifact sup pression was achieved by implementing a prospective k-space reordering scheme in conjunction with slice position correction. Twelve patients with aortic insufficiencyand 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 areaof the mitral valve, differences were still substantial in moderate-to-severe mitral regurgitation (19%). The moving slice velocity mapping techniquewas successfully applied in patients with aortic and mitral regurgitation. The importance of correction for valvular through-plane motion is demonstrated. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 12:28:10