title: Image formation in double-contrast roentgenography of the GI tract. Experimental and theoretical observation and practical implications.
mesh_terms: D000388:Air; D001466:Barium Sulfate; D004064:Digestive System / Q000000981:diagnostic imaging*; D006801:Humans; D011859:Radiography; D013679:Technology, Radiologic
chemical_list: D001466:Barium Sulfate