title: Pulmonary perfusion measurements by videodensitometry. Methods and preliminary results.
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation* / Q000379:methods; D000293:Adolescent; D002648:Child; D006331:Heart Diseases / Q000000981:diagnostic imaging; D006801:Humans; D008168:Lung / Q000098:blood supply*; D011651:Pulmonary Artery / Q000000981:diagnostic imaging