Or for insurance purposes, something to point to in court. Defensive medicine, in other words.
Will not suggest for a moment that a CT isn’t used defensively by physicians. But in the end, the radiation dose while high in the general scheme of things, isn’t going to kill you now or in the future. Maybe if you have them every couple of months for years at a time it might.
FWIW, They can’t prove any of this. If they could, they would have provided the empirical data to support their assertion. CT has been in wider clinical use since the mid 80’s with the Elscint Reticulated units that worked like a pendulum. The GE 8800 and 9800’s of the early 90’s were some of the first helical’s. So we’re looking at about 20 years worth of data max. Now, with the 0.4 sec rotation 128 slice, systems better contrast agents, they offer much more diagnostic images.
I knew this CT tech who was a bit of a perv. He did a scan on this 15 year old girl (the scan was ordered by her physician), and showed me things about certain portions of her anatomy that only god and her husband should ever know.