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