title: Roentgenologic determination of the variations in heart volume during the cardiac cycle.
mesh_terms: D000328:Adult; D002306:Cardiac Volume; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging* / Q000502:physiology / Q000503:physiopathology*; D006331:Heart Diseases / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D011859:Radiography; D013997:Time Factors