title: 13N-head activity following rectal administration of 13N-ammonia as a porta-systemic shunt index.
mesh_terms: D000328:Adult; D000368:Aged; D000641:Ammonia / Q000008:administration & dosage; D003097:Collateral Circulation; D005260:Female; D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D008103:Liver Cirrhosis / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D009590:Nitrogen Radioisotopes; D011168:Portal System / Q000503:physiopathology*; D011877:Radionuclide Imaging; D012007:Rectum
chemical_list: D009590:Nitrogen Radioisotopes; D000641:Ammonia