title: Reproducibility of ejection fraction measurements by gated equilibrium blood pool scintigraphy.
abstract: The reproducibility of ejection fraction measurements has been studied using gated equilibrium blood pool scintigraphy. The use of appropriate statistical tests is proposed and commented upon. The intra-observer variability for our group of patients has a standard deviation of 6.4%, the interobserver variability of 3.2% and sequential studies done on the same and different days give standard deviations (due to "time" alone) of 1.0% and 1.9%, respectively. Different factors and sources involved in variability are mentioned. Variability values reported in the literature are discussed.
mesh_terms: D000328:Adult; D000368:Aged; D002302:Cardiac Output; D003327:Coronary Disease / Q000503:physiopathology; D005260:Female; D006334:Heart Function Tests; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013318:Stroke Volume