title: Assessment of the orifice area of bioprosthetic valves by orifice-view roentgenography.
mesh_terms: D001021:Aortic Valve / Q000000981:diagnostic imaging*; D001705:Bioprosthesis; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging; D006350:Heart Valve Prosthesis; D006801:Humans; D008943:Mitral Valve / Q000000981:diagnostic imaging*; D011859:Radiography