title: Physical aspects of X-ray pulmonary densitometry.
mesh_terms: D015502:Absorptiometry, Photon / Q000295:instrumentation; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008961:Models, Structural; D011652:Pulmonary Circulation / Q000502:physiology*; D012119:Respiration / Q000502:physiology*