RisksBy Mayo Clinic staff
Because CT angiograms use an X-ray machine to take pictures of your heart, you will be exposed to some radiation during the test. The amount of radiation varies depending on the type of machine used. With the most common type of X-ray machines, the radiation you're exposed to during the test is about the same as the average American is naturally exposed to over three years. The risk that you could develop cancer from the radiation you receive during a CT angiogram is not known exactly, but is very small.
Because radiation can harm an unborn child, you shouldn't have a CT angiogram if you're pregnant.
It's also possible that you could have an allergic reaction to the dye used in the procedure. Talk to your doctor if you're concerned about having an allergic reaction.
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