During an angioplasty, how much radiation will I be exposed to?

Angioplasties are very safe in this day and age with modern medicine and technological advancements.

An angioplasty is performed whenever a patient has symptoms along with risk factors suggesting there is coronary disease (ie heart vessel narrowing or blockage usually due to fat deposit). Following insertion of local anaesthetic a thin tube called catheter is inserted in the artery in the wrist (through the groin in the olden days, rare now) and threaded upto the heart. This is painless usually as the blood vessel lacks nerves to feel touch or pain though sometimes spasm can occur. Following this dye is injected (again painless) and the arteries can be visualized along with any blockages.