Hoek, C.

method contour study image ejection fraction frame background center ejection fraction count procedure dual-roi gated region value patient analysis sum image position result computation detection background region table number center position dual-roi method contrast gated blood-pool scintigrams lv activity structure variable-roi method es contours fixed-roi method blood-pool activity pixel scintigram fixed-roi group success score lv center difference contrast ventriculography variable-roi cost matrix curve medicine factor ventriculography time-activity background regions operator acquisition matrix radiographie success data acquisition algorithm comparison score scintigraphic right blood pool imaging blood contour detection dual-roi methods es frames volume count densities function operator interaction lv boundary boundary ieee cat variable-roi methods time-activity curve scintigraphic ef /pixel radionuclide