The FDA has a great page on the topic with citations to medical journals: https://www.fda.gov/radiation-emitting-products/medical-x-ray-imaging/what-are-radiati

The FDA has a great page on the topic with citations to medical journals: https://www.fda.gov/radiation-emitting-products/medical-x-ray-imaging/what-are-radiation-risks-ct https://www.fda.gov/radiation-emitting-products/medical-x-ra... The short answer: > If you combine the natural risk of a fatal cancer and the estimated risk from a 10 mSv CT scan, the total risk may increase from 400 chances in 2000 to 401 chances in 2000. Your specific CT scan of the heart might be less than half of the 10mSv dose used in this example so the radiation risk is even lower.