Angiography is the x-ray imaging of blood vessels using a contrast agent (dye). The dye makes the blood vessels visible with an x-ray.
Its purpose is to show the blood supply moving to and from an organ. For the kidney, for example, the aorta and renal arteries are studied.
Angiography is helpful to:
- Learn the location of a narrow or blocked blood vessel
- Treat a diseased blood vessel
- Find internal bleeding (to stop the bleeding)
- Locate and remove a blood clot in a blocked blood vessel
- Treat certain types of tumors by blocking their blood supply
- Make a map of your blood vessels before surgery
It is most commonly used to help with treatment, rather than for diagnosis alone.