Cholangiography is the imaging of the bile duct (also known as the biliary tree) by x-rays and an injection of contrast medium.

There are at least four types of cholangiography:^{[citation needed]}

In both cases fluorescent fluids are used to create contrasts that make the diagnosis possible. Cholangiography has largely replaced the previously used method of intravenous cholangiography (IVC).^{[citation needed]}