Entering the MRI room myself I was very familiar with the dangers of bringing metal inside, to the point where I would second guess myself and my own body. "What if my leg bone actually has metal in it for some reason?!"
I know people who if you tried to explain an MRI to them, would become visibly uncomfortable and search for any way to change the topic.
Expected behavior. Explanations of complex topics are to be rejected if explainer does not have sufficient authority to make behaver hold-still-and-listen.
I know such folk, too, and this is among the thing about people which annoys me to no end. If a MRI tech tried to explain the shit to one such acquaintance, they would try to change the subject like you say. OTOH, if the doctor in charge tries the same, the listener will instead have to zone out. But zoning out is a more expensive operation, as any zooner knows. (Which is why they hold doctors, lawyers, and other semi-priests in high reverence, up to pushing kids to take up these rather joyless professions to the exclusion of all sense.)
Peeps here equally well-behaved other way round tho. C-f "mal" = 0. Geez I really needed to witness the absolute by-the-book Freudian slip that can be found at 1:55 of one of the probably infinite interview cuts, then have MRI safety explained to me by hacker noosers on their Monday morning.
I have a titanium plate in my head, so it's not magnetic.
When the MRI tech asked if I had any metal in me, I said I had titanium on my skull.
She asked if I was sure it was titanium.
I knew it was, but I was nervous, so I said, "I think so."
She half-joked, "Well, if it's not, we'll find out real quick."
It was titanium.
But they never really double-checked or anything.
Part of me thinks that because of my age, she could tell it wasn't iron or anything dangerous.
But another part of me feels like she honestly didn't care that much and meant it when she said we'd find out fast.
Its not like in the movies where you have to be right up on it, and certain materials may attract at higher rates depending on the amount of ferromagnetic materials affected by the flux.
Field flux lines may also be warped depending on the geometry so its possible the drop-off wasn't calculated properly during initial facility design, or it changed.
Walking through the wrong door can have consequences as the news has reported.
The effect for magnetic fields is that generally once the field is enough to obviously move an object it's already accelerating uncontrollably.
Consider the “Things I Won’t Work With” column. There is a healthy degree of respect for various compounds that’s learned with experience. This is similar to the way that (properly trained) electricians work with electricity, and nuclear plant techs work around radioactive material.
I had that constant thought for the 15 minutes of my knee MRI (except s/leg bone/body/). Most discombobulating.
If MRI scanners are this deadly, everybody should be really thoroughly screened and scanned to be allowed into the room. And even into the room next to it. How can the door of that room open while the machine is still turned on? (Edit: apparently the magnets in these machines usually can't be turned off, which changes the question to: how was he allowed to enter the room at all?)
But wearing such a heavy chain while accompanying your spouse to an MRI scan, is also not the best move.
One of the reasons they ask what you do for work is because if you're doing some sort of job that involves working with metal (e.x. cutting pipes, welding, etc) there are extra precautions to take.
Having an alarm that goes off for a staff member’s bra 200x a day leads to normalisation of hearing the alarm, and the unsafe things gets missed.
Im an MR tech.
And then what if they also have a pacemaker or aneurysm clip?
An unsafe clip is tiny, and it will kill them. You can’t depend on a metal detector.
Technology might help, but people following process is what safety depends on.
If staff follow the rules the MR suite is very safe.
Belts, buckles, bra etc are fine on staff.
A coin is a problem. Hip or knee joint replacement and various screws and plates are fine (some contain some iron).
Like all bad answers, the answer as to whether it’s ok in the scan room is ‘it depends’.
Spinning rust hard drives are also made with mu-metal as well.
https://www.robarts.ca/scholl_group/research/peripheral_nerv...
Apparently it's not an issue, even if you do have them.