CHOLECYSTOGRAPHY AND CHOLANGIOGRAPHY
GALLBLADDER General Radiographic studies of the Gallbladder are rarely done. These studies have been replaced with other modalities such as ultrasound. (1) Radiographic visualization of the gallbladder is done by cholecystography . Radiographic investigation of the biliary tract is by cholangiography . For these procedures, it is necessary to convey a contrast medium to the gallbladder along with the bile. (2) Bile is manufactured by the polyhedral cells of the liver which extract the necessary constituents from the circulating blood. The gallbladder's ability to concentrate the bile makes it possible for a sufficient amount of the cholecystopaque to collect within the gallbladder to permit radiographic visualization. After oral administration, the contrast medium, if in pill form, disintegrates in the stomach. (a) Most of the contrast medium is absorbed in the small bowel and connveyed to the liver via the portal vein. (b) As the contrast medium moves t