Pg. Walker et al., Motion correction for the quantification of mitral regurgitation using thecontrol volume method, MAGN RES M, 43(5), 2000, pp. 726-733
Citations number
14
Categorie Soggetti
Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment
Quantifying mitral regurgitation is difficult because of the complexity of
the flow, geometry and motion of the mitral valve. In this paper a MRI comp
atible phantom was built incorporating a left ventricle and mitral valve mo
tion. Valve motion was obtained using a pneumatic piston. The mitral valve
was made regurgitant and the regurgitant volume quantified using a modified
control volume method. The modification to the method was the addition of
mitral motion correction. This was attained by moving the control volume in
unison with the mitral valve and by correcting for this motion in the inte
gration of velocity. This correction was found to be simple, in that it rep
resented the volume swept out by the moving control surface. The measured r
egurgitant volume was compared to a second MR measurement using a single sl
ice technique, made possible by the tubular construction of the phantom's l
eft atrium. Regression analysis between these two methods produced a regres
sion line of y = 0 + 1.02 x; R = 0.97; standard error of the estimate = 3.4
7 ml, Magn Reson Med 43:726-733, 2000. (C) 2000 Wiley-Liss, Inc.