title: The double contrast meal--new high density barium sulphate powders.
mesh_terms: D001466:Barium Sulfate; D005767:Gastrointestinal Diseases / Q000000981:diagnostic imaging*; D006801:Humans; D007413:Intestinal Mucosa / Q000000981:diagnostic imaging; D008722:Methods; D011859:Radiography
chemical_list: D001466:Barium Sulfate