title: Why do a lung scan?
mesh_terms: D003287:Contrast Media; D003937:Diagnosis, Differential; D005069:Evaluation Studies as Topic; D006439:Hemodynamics; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000175:diagnosis*; D011187:Posture; D011652:Pulmonary Circulation; D011655:Pulmonary Embolism / Q000175:diagnosis; D011859:Radiography; D011877:Radionuclide Imaging; D014692:Ventilation-Perfusion Ratio
chemical_list: D003287:Contrast Media