title: Measurement of blood flow in the vertebrobasilar system.
mesh_terms: D000328:Adult; D002560:Cerebrovascular Circulation; D006801:Humans; D007726:Krypton; D008297:Male; D008875:Middle Aged; D011868:Radioisotopes; D014055:Tomography, Emission-Computed; D014715:Vertebrobasilar Insufficiency / Q000000981:diagnostic imaging*
chemical_list: D011868:Radioisotopes; D007726:Krypton