[doesnotexist]

There have been and continue to be technological improvements that reduce the dosage required. There is not a single dosage for all CTs. The dose for a head CT is an order of magnitude less than for abdominal/pelvic CT.

"The current average effective dose of a CT study is ∼10mSv, with the implementation of dose reduction techniques discussed herein; it is realistic to expect that the average effective dose may be decreased by 2–3 fold." 2010 https://www.ejradiology.com/article/S0720-048X(10)00311-6/fu...

It would be neat to see a chart of the average effective dose of CT studies over the past 40 years. And any accounting of how much it declined as a result of Moore's law and software improvements for producing the "Computed Tomography."