special subjects
Angiography
Variations of Angiography
Arteriography produces an image of arteries and is the most common type of angiography. Venography produces an image of veins. Ultrasonography has largely replaced venography in the diagnosis of clots in veins ( Deep Vein Thrombosis (DVT) ). Digital subtraction angiography provides images of the brain's blood vessels. During this procedure, x-ray images of blood vessels are taken before and after a Radiopaque Contrast Agents is injected. Then a computer subtracts one image from the other. Images of structures other than arteries (such as bones) are thus eliminated. As a result, the arteries can be seen more clearly. 