Historically there were actually "live" x-ray machines, where you could have seen yourself wiggling your toes. They aren't used now due to the horrific exposure to x-rays, but before that was understood to be bad they were used in shoe shops (!). I don't know that they were ever used in hospitals though
Edit: This is the type of machine it was: https://www.dmxworks.com/
Which also takes into account how much time you spend outside during daylight hours, right?? That seems like such a large confounding variable that it renders the hospital-side measurement kind of pointless...
For multiple exposures in motion, it will add up, but assuming there's a reasonable diagnostic benefit and the total exposure isn't too long, and the staff is well protected, it's a reasonable risk.
Checking your Wikipedia link: Yikes! These were used into the 1970s.
And of course industry denialism of any possible harm the devices might cause....
SMFH
At least they had the good sense to give it up when notified.