If you get a stress test, either treadmill or nuclear, and there is indication of heart issues, particularly artery blockage, a coronary angiography with catheterization gives them the ability to treat blockages found with angioplasty with or without installing stents.. otherwise, if you don’t set up the catheterization, you get to do it again doubling the amount of radiation received.
And since it is done with only good pain meds, you can watch the whole thing on wide screen tv.