Rapid, semiautomated technique for estimating left ventricular volume

Abstract

A new system for rapidiy quantitating left ventricular volume using two-dimensional echocardiography is tested. This system relies on a microprocessor built into a sector scanner that immediately calculates the length, area, and volume of the chamber being imaged using the mathematical model of an ellipsoid of revolution. The calculations are made after the observer superimposes a smooth calibrated ellipse outline on the endocardium imaged with the sector scanner. We report our experience with this system in 50 patients with a variety of cardiac disorders and compare the left ventricular volumes measured with those obtained using cineangiography, M-mode, and more detailed light pen tracing techniques. Correlations between volumes measured with the elliptical calipers and angiography were good ( r = 0.820, SEE ± 38.8 ml) (n = 100), but not as good as that between light pen tracing of the echo images and angiography ( r = 0.847, SEE ± 27.8 ml) (n = 22). M-mode correlated less well with angiography ( r = 0.789; SEE ± 42.1 ml) (n = 90). We conclude that the calibrated ellipse system is rapid and simple to use, while its accuracy matches previous studies using two-dimensional echocardiography to quantitate left ventricular volume.