Expect all healthcare machines to be networked, even if only internally. Need the active directory to login and need to upload the image/test sample somewhere else after it's taken. That's sadly one reason why ransomware can propagate so easily and stop hospitals. :(

In theory there can be computers with no network, typically an isolated computer attached to heavy test machinery, but it's becoming impossibly rare in all industries.

And they should be easy to recognize, look for the post-it nearby with the shared username/password to unlock it, also notice the doctors leaving with the x-ray printed on paper or a USB key to be able to transfer it elsewhere.