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The catheter can be advanced into the coronary arteries and a dye injected into the arteries (coronary angiography or arteriography). With the use of fluoroscopy (a special type of X-ray), the doctor can identify blockages in the coronary arteries as the dye moves through them.
1 At the tip of the catheter is a small inflatable balloon and a small tube of stainless steel mesh, called a stent.  Some dye (contrast) is injected into the catheter so that your arteries can be seen on an x-ray screen. This helps show where the narrowings in your arteries are, and how severe they are.