I can see the thinking that lead to this. But in my mind, it boils down to one bad decision after other, concealing the firearm because each step forward carries worse consequences. It's basically the clown-makeup meme:

0. Carry gun around because that's what I always do.
1. Walk into hospital - whoops, I'll just keep it concealed so I don't get in trouble. Can't hand it over to someone either, or leave it in my car; that's a felony.
2. Check in for appointment - can't back out now, it took forever to get this appointment and there's a penalty for a no-show.
3. Change clothes for MRI - can't leave my gun lying around, that's also a no-no and someone could get hurt. I'll just tuck it... somewhere.
4. Walk into MRI exam room - had to say "no" about metal on my person. These medical people are overly careful anyways.
5. Actively getting an MRI - what's the worst that could happen?

Do we need airport-style backscatter x-rays prior to MRI procedures now? In hindsight, it seems like cheap insurance.