Perfusion defects in the aging lung.
D000368:Aged; D000375:Aging; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000175:diagnosis; D011652:Pulmonary Circulation; D011655:Pulmonary Embolism / Q000175:diagnosis; D011859:Radiography; D011877:Radionuclide Imaging