<Tr> <Th_colspan="2"> Double - contrast barium enema </Th> </Tr> <Tr> <Td_colspan="2"> Medical diagnostics </Td> </Tr> <Tr> <Td_colspan="2"> Human intestinal tract, as imaged via double - contrast barium enema </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr>

What is the difference between single and double contrast