title: The effect of various background protocols on the measurement of left ventricular ejection fraction in equilibrium radionuclide angiography.
abstract: Four methods of calculating left ventricular ejection fraction from equilibrium radionuclide angiography have been assessed for inter-observer variability and compared to single-plane contrast cineangiography. The superiority of data-processing methods which use a left ventricular region of interest which follows the changing size of the left ventricle into systole is demonstrated. A simple method of correcting for background is suggested as an alternative for those centres not possessing the necessary software for methods involving a changing region of interest.
mesh_terms: D000790:Angiocardiography; D001417:Background Radiation; D002302:Cardiac Output; D002932:Cineangiography; D003201:Computers; D006321:Heart / Q000000981:diagnostic imaging*; D006334:Heart Function Tests / Q000379:methods; D006801:Humans; D011877:Radionuclide Imaging; D013318:Stroke Volume