title: Clinical value of krypton-81m and technetium-99m perfusion lung scanning.
mesh_terms: D006801:Humans; D007726:Krypton; D008168:Lung / Q000000981:diagnostic imaging; D008171:Lung Diseases / Q000000981:diagnostic imaging / Q000503:physiopathology*; D011868:Radioisotopes; D011877:Radionuclide Imaging; D012119:Respiration; D013667:Technetium; D014692:Ventilation-Perfusion Ratio
chemical_list: D011868:Radioisotopes; D007726:Krypton; D013667:Technetium