title: A "bag in box" system in regional ventilation studies of the lung with xenon-133.
mesh_terms: D003201:Computers; D006801:Humans; D008433:Mathematics; D011877:Radionuclide Imaging; D013667:Technetium; D014692:Ventilation-Perfusion Ratio; D014978:Xenon
chemical_list: D014978:Xenon; D013667:Technetium