A GEOMETRIC-METHOD OF MEASURING THE LEFT-VENTRICULAR EJECTION FRACTION ON GATED TC-99M SESTAMIBI MYOCARDIAL IMAGING

Geometric measurements of the left ventricular diameters as used in bi plane angiocardiography and echocardiography were applied to gated SPE CT Tc-99m sestamibi myocardial scintigrams in order to calculate the l eft ventricular ejection fraction. These measurements take no longer t han 5 minutes and require no additional computer software. In a review of 79 examinations, the left ventricular ejection fraction calculated using these measurements correlated well with the echocardiographical ly estimated ejection fraction (r = 0.78, P < 0.0001). The technique i s highly reproducible with an intraobserver correlation of r = 0.94 an d interobserver correlation of r = 0.93.