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Titolo:
Heart motion adapted cine phase-contrast flow measurements through the aortic valve
Autore:
Kozerke, S; Scheidegger, MB; Pedersen, EM; Boesiger, P;
Indirizzi:
Univ Zurich, Inst Biomed Engn & Med Informat, CH-8092 Zurich, Switzerland Univ Zurich Zurich Switzerland CH-8092 rmat, CH-8092 Zurich, Switzerland Swiss Fed Inst Technol, Zurich, Switzerland Swiss Fed Inst Technol Zurich Switzerland Technol, Zurich, Switzerland Aarhus Univ Hosp, Dept Cardiothorac & Vasc Surg, MR Ctr, Aarhus, Denmark Aarhus Univ Hosp Aarhus Denmark ac & Vasc Surg, MR Ctr, Aarhus, Denmark Aarhus Univ Hosp, Inst Expt Clin Res, MR Ctr, Aarhus, Denmark Aarhus Univ Hosp Aarhus Denmark Expt Clin Res, MR Ctr, Aarhus, Denmark
Titolo Testata:
MAGNETIC RESONANCE IN MEDICINE
fascicolo: 5, volume: 42, anno: 1999,
pagine: 970 - 978
SICI:
0740-3194(199911)42:5<970:HMACPF>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
DOPPLER ECHOCARDIOGRAPHY; MR; REGURGITATION; VELOCITY; QUANTIFICATION; INSUFFICIENCY; SEVERITY;
Keywords:
velocity mapping; through-plane motion; valve flow;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Boesiger, P Univ Zurich, Inst Biomed Engn & Med Informat, Gloriastr 35, CH-8092 Zurich, Switzerland Univ Zurich Gloriastr 35 Zurich Switzerland CH-8092 itzerland
Citazione:
S. Kozerke et al., "Heart motion adapted cine phase-contrast flow measurements through the aortic valve", MAGN RES M, 42(5), 1999, pp. 970-978

Abstract

A method for magnetic resonance cine velocity mapping through heart valveswith adaptation of both slice offset and angulation according to the motion of the valvular plane of the heart is presented. By means of a subtractive labeling technique, basal myocardial markers are obtained and automatically extracted for quantification of heart motion at the valvular level. The captured excursion of the basal plane is used to calculate the slice offsetand angulation of each required time frame for cine velocity mapping. Through-plane velocity offsets are corrected by subtracting velocities introduced by basal plane motion from the measured velocities. For evaluation of the method, flow measurements downstream from the aortic valve were performedboth with and without slice adaptation in 11 healthy volunteers and in four patients with aortic regurgitation, Maximum through-plane motion at the aortic root level as calculated from the labeled markers averaged 8.9 mm in the volunteers and 6.5 mm in the patients. The left coronary root was visible in 2-4 (mean: 2.2) time frames during early diastole when imaging with aspatially fixed slice. Time frames obtained with slice adaptation did not contain the coronary roots. Motion correction increased the apparent regurgitant volume by 5.7 +/- 0.4 ml for patients with clinical aortic regurgitation, for an increase of approximately 50%. The proposed method provides flow measurements with correction for through-plane motion perpendicular to the aortic root between the valvular annulus and the coronary ostia throughout the cardiac cycle. Magn Reson Med 42:970-978, 1999. (C) 1999 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 09:09:01