title: Radioisotope methods for determination of regional V/Q-ratios in the lung.
mesh_terms: D006801:Humans; D007726:Krypton; D011652:Pulmonary Circulation; D011868:Radioisotopes; D013667:Technetium; D014692:Ventilation-Perfusion Ratio; D014978:Xenon
chemical_list: D011868:Radioisotopes; D014978:Xenon; D007726:Krypton; D013667:Technetium