title: The double contrast meal--new high density barium sulphate powders.
mesh_terms: D001466:Barium Sulfate; D004064:Digestive System / Q000000981:diagnostic imaging; D006801:Humans; D010276:Parasympatholytics; D011859:Radiography; D013679:Technology, Radiologic
chemical_list: D010276:Parasympatholytics; D001466:Barium Sulfate