If you do that, how do the images get from the x-ray machine to the radiologist for analysis? How do they end up as part of the electronic health record & acces

If you do that, how do the images get from the x-ray machine to the radiologist for analysis? How do they end up as part of the electronic health record & accessible for future use? If you create an air gap and ask people to use USB sticks to move data from "mission-critical" systems to the main network, you only slightly reduce the risk of those systems becoming infected and you now have a situation that's much less convenient (time is money) and creates a new vector for leaking personal health information.