MRIs work because strong enough magnetic fields will interact with any material, not just ferrous metals. This can be impacted by the structure said materials form (stents are a weave like a finger trap and therefore more prone to interaction with magnetic fields than say a solid cylinder) but I’d be inclined to say your friend was lucky. Ball bearings like in the OP are nearly always steel outside of specific high end applications and therefore would behave like they were coming out of a shotgun shell.
Comment on Small little shenanigans
MehBlah@lemmy.world 4 hours agoI know someone with metal pins in their leg and they have had a MRI. It depends on the metal. Since I didn’t specify what kind of metal everyone rushes forward to speculate on how wrong I am.
dylanmorgan@slrpnk.net 3 hours ago
wonderingwanderer@sopuli.xyz 2 hours ago
The post is obviously insinuating that these are iron balls, so in this context you are wrong.
wolframhydroxide@sh.itjust.works 1 hour ago
Except that they’re clearly zinc shot. I think the poster made a funny without realising that they aren’t steel.