title: Perfusion agents given by inhalation.
mesh_terms: D002561:Cerebrovascular Disorders / Q000000981:diagnostic imaging*; D005740:Gases / Q000008:administration & dosage; D006801:Humans; D007269:Injections, Intra-Arterial; D008722:Methods; D011868:Radioisotopes / Q000008:administration & dosage; D011877:Radionuclide Imaging; D012119:Respiration
chemical_list: D005740:Gases; D011868:Radioisotopes