It was completely baffling to me how someone as brilliant as SA could conclude that "the risk of dying from the screening exam was 1/660".

However, the paper he references does contain the specific example:

> For example, a 40-year-old woman undergoing CT coronary angiography is estimated to have a 1 in 270 chance of developing cancer at a radiation dose of approximately 20 mSv

At this point I'm completely lost here.