Cholangiogram: Radiographic imaging of the bile ducts after the direct injection of radio-opaque dye.

Ultrasound: A diagnostic imaging technique which uses high-frequency sound waves and a computer to create images of blood vessels, tissues, and organs. Ultrasounds are used to view internal organs as they function, and to assess blood flow through various vessels.

Bile Duct: A tube through which bile passes in and out of the liver.