Delineation of the Watershed between Right and Left Hepatic Arterial Territories with Carbon Dioxide-enhanced Ultrasonography

CO2-enhanced US is useful to delineate arterial territories of hepatic segments and show crossover arterial supply compared with Couinaud segments. Awareness of crossover arterial supply is important for chemoembolization, segmental chemoembolization, hepatic arterial infusion, sonography, and surgery.