title: Roentgenographic examination of the colon: relevant questions.
mesh_terms: D001464:Barium; D003106:Colon / Q000000981:diagnostic imaging*; D003108:Colonic Diseases / Q000000981:diagnostic imaging; D003110:Colonic Neoplasms / Q000000981:diagnostic imaging; D003287:Contrast Media; D004733:Enema; D011859:Radiography / Q000592:standards
chemical_list: D003287:Contrast Media; D001464:Barium