An article that was published after RSNA talks about a study that found that CT scan radiation risk in patients may be overblown. However, at the close of the article, it says that longer-term, more in-depth study is needed. Until then, physicians and patients still need to weigh the risks and benefits of CT.
For patients to both be informed and to understand (comprehend) risk related to radiation is very challenging. This is because there are few comparables in normal daily life which can clearly quantify extremely small risks. The one I like the most is: 10 mSv give you a risk of dying from an induced cancer of about 1 in 4000. Driving a car in the USA for 80,000 miles over 3 years also gives you a risk of about 1 in 4000 of dying in a car accident.
Now, both a CT scan with 10 mSv and 80,000 miles of use of a car bring certain benefits. But they carry a risk of dying of 1 in 4000. What do you think of that risk/benefit ratio? Would that ratio make you stop driving a car?