Definitely seen multiple too over the years. I can’t list them or tell how truthful they were though.
I’m not sure if that’s what you mean but I’ve heard of thick metal shields to protect medical implants during an MRI. I think they are pretty common. I can’t imagine someone removing their pacemaker for an MRI.
What I always recommend is to talk with the MRI technicians in person before you take any decisions.
Maybe they have the appropriate shield maybe they don’t.
Maybe they think it won’t matter maybe they do.
Maybe they will recommend some other scan or ask you to get it removed.
They are the one who know the specs of their machine and they’ve seen many medical implants before.
On the same topic, a tip I feel is not mentioned enough:
Have a medical card in your wallet and your phone mentioning your implants. If you’re brought in unconscious how the h* are they supposed to know?