Estimation of ejection fraction and stroke volume using single- and biplane magnetic resonance imaging of the left cardiac ventricle.
BACKGROUND
In cardiac magnetic resonance imaging (MRI), left ventricular stroke volume (SV) and ejection fractions (EF) are occasionally calculated using single-plane and biplane ellipsoid models. In previous studies, the calculated SV and EF using single- and biplane ellipsoid models have been compared to reference values calculated from short-axis (SA) images. In these studies, however, it has been emphasized that through-plane motion of the basal SA images represents an important source of error, which may result in incorrect reference values.


OBJECTIVE
To compare the calculated SV and EF using single-plane and biplane ellipsoid models with SV and EF calculated from SA images in which compensation was made for through-plane motion.


METHODS
A group of 20 patients who underwent MRI examination were included in the study. SV and EF were calculated using the stack of SA images (which had been compensated for through-plane motion) and compared to the SV and EF calculated according to the single- and biplane ellipsoid models.


RESULTS
The mean difference between the single-plane model and the reference was -0.3+/-6.5 for EF and 7.2+/-17.1 ml for SV. Corresponding comparison between the biplane method and the reference resulted in a mean difference of 0.3+/-6.1 for EF and 11.8+/-14.9 ml for SV.


CONCLUSIONS
The results from this study show that left ventricular EF can be adequately estimated using the single- and biplane ellipsoid models, while SV tends to be overestimated using both geometrical models.
Department of Biomedical Engineering, Orebro University Hospital, Orebro, Sweden. per.thunberg@orebroll.se
P
P
Thunberg
K
K
Emilsson
P
P
Rask
A
A
Kahari
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D005260:Female; D006352:Heart Ventricles / Q000033:anatomy & histology*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D013318:Stroke Volume