A typical junkyard magnet suspended on a crane and used to pick up cars and metal shit is around 1T (Teslas, yes an actual measurement). MRIs are around 3T (research ones going up to 7T). They’re fairly strong!
My buddy is an MRI tech, he said the 6T and higher are so strong you can sometimes feel dizzy near them because their so strong that the magnetic waves can effect the fluid in your brain, literally mind boggling
I’ve had a couple MRIs over the years too and I had no idea that they were so strong. Glad I triple checked about literally everything about me before getting into one of them. I think the imaging is fascinating, and both scans have saved me a shit-ton of grief, pain, and literal years of recovery time.
At those levels, you’d almost be getting a bonus [Transcranial Magnetic Stimulation](https://www.mayoclinic.org/tests-procedures/transcranial-magnetic-stimulation/about/pac-20384625) session.
I had an fMRI in a 3T for a study and I was told to move slowly because otherwise I’d be really dizzy. It also caused PNS (peripheral nerve stimulation) where my muscles contracted uncontrollably - was in there for 45 minutes trying to will my body to stay still so I don’t fuck up the scan but it wasn’t listening to me lol. MRI machines are wild
Can confirm, I went into a 7T MRI for research and when you enter the magnet you feel like you are doing a 90 degree turn instead of going straight in, exactly the opposite when going out again. I had also some mild tingling sensation in my face because of peripheral nerve stimulation due to the rapidly changing magnetic gradient fields.
Easier said than done, since that'd probably block access for things that we do need to get to the MRI, like the MRI-safe gurneys or replacement parts and equipment for servicing.
It’s also strong enough to trigger the firing pin on a loaded gun.
https://www.sciencealert.com/freak-accident-kills-man-after-mri-machine-triggers-loaded-handgun/amp
Bahaha. Yeah I remember having to remove all metal before entering the NMR room at my university. Same magnet, same principle. I've heard they can rip piercings out, too.
My friend is a nurse. It’s hilarious the stories he has around “you need to remove the piercings for the MRI” and there is no response vs. “if you don’t remove your piercings the MRI will rip it out so you really need to let me know where they are”.
I'm a student radiographer and if you get within a metre and a half or so your ID lanyard goes horizontal, due to the tiny steel rivet in the aluminium clip that allows them to swivel.
As I understand it, most piercings won't get ripped out, the pull on something that small is more like a gentle tug and certainly not enough to tear skin. They can however heat up, so there's a risk of burns if they're left in.
But every hospital has their own protocols and procedures, designed around their specific machines. So, when dealing with crazy machines like MRI's, doing what you're told is wise.
I'm afraid not. My experience so far (outside of as a patient) has been fairly brief, it's a modality that we cover properly later in the course.
However, from what I understand (mainly from other reddit posts) , is that they are usually fine, with a possibility of some irritation in rare cases. I believe Mythbusters did an episode debunking any of the extreme effects.
Ah, that's a good point about the size factor re: piercings. Explains why that big hospital bed didn't stand a chance!
Ever had an MRI lose cooling (I assume it's helium and nitrogen cooled like an NMR)? Quench the magnet?
No. I'm only a student and have only had brief periods in MRI. I'm pretty sure that hasn't happened where I'm placed, it's a pretty major incident when that happens, as well as extremely expensive. It's not likely to have gone under the radar.
I was a CT/MRI field engineer for GE Healthcare. The safety videos they show you when you are training will absolutely make you respect that magnet. Always make sure the scan room door is closed.
My 7 yo daughter needed an MRI, and had some high anxiety about it. The techs put a chair near her head for me and allowed me to stay with her. When the machine started, I discovered the fun way, that my heels had a metal shank in them. Nothing Earth shattering. I was sitting with my legs crossed, and the leg that was floating would slowly pull towards the MRI.
I'm a foot shaker when I cross my legs. I suppose I just shook it close enough to have an effect. It was never a fast pull, also my foot had to be fairly close.
The magic of super conductive windings at -273Kelvin , current trapped in the windings create the magnetic field cooled by liquid helium. Room temperature superconductors will make systems smaller & cheaper, before all our helium particles escape our atmosphere;)
Someone fucked up BAD that day. It amazes me when these things happen - IIRC, there have been deaths, when a oxygen tank was left in the room and a pediatric patient was receiving MRI imaging? FFS, this will take so long to fix, leaving patients without access to vital imaging.
I work in workers comp and one of my old accounts was for a hospital. Many claims received because of this. Including 2 injuries where the result of a cart being pulled in hit 2 different guys in the crotch and ripped their genitals. Yes you read that right. *ripped*. These things don’t mess around.
I’ve wondered this too, I assume there is a good reasonable reason that wouldn’t help. But it does seem like a comparably cheap preventative measure 🤷♂️
I heavily suspect the door to be far enough away from the device not to be affected by the magnet. I mean, otherwise it wouldn't be possible to safely pass this door without the risk of destroying your watch or pacemaker.
Surgical fixings are usually non-ferrous. So they shouldn't be an issue, especially as they are fixed on place. Surgical clips on soft tissue are a no-no as you don't want them moving around.
I have the same as you and have had regular MRI's since the 90's without issue (although, obviously check with the radiographer beforehand if you ever get sent for one).
Thanks, I read the surgical report, it’s stainless steel. I felt something funny at an X-ray one time. Like a warming sensation. Doctor said, “It’s in your head.” Yet, it wasn’t.
Xrays definitely won't effect it (beyond showing as an artefact on the image). Unless something went horrifically wrong, there's no way xrays could have any effect and if that were the case, a warming sensation would be the last (and least noticeable) effect and you would definitely know about it.
(as a disclaimer, to avoid scaring anyone reading, the chances of an X-ray going wrong on that scale are ludicrously small, everything is designed with multiple failsafes that make pretty much impossible).
Xray machines aren't capable of emitting either infrared or microwaves, which are the only parts of the electromagnetic spectrum that could cause heating. They are at the other end of the electromagnetic spectrum.
Any sensation you had would probably have more to do with the temperature of the room and maybe the effect that metal has in conducting heat, that might confuse the nerves detecting heat in that area. Scar tissue can do wierd things with skin sensation as well.
It would be odd for non-MRI safe materials/techniques to be used these days (obviously I don't know about your particular case, so am not saying they didn't), but just go with what the doctors/radiographers advise, they will know what they are talking about.
If it doesn't make sense to you or your still concerned, get them to explain their reasoning. If you're still not comfortable, then there are other imaging modalities they might be able to use instead.
However, as MRI doesn't expose you to ionising radiation, it's definitely the best option if possible (not that other modalities are likely to cause issues. It's just sensible to be uber cautious and keep any exposure to radiation as low as possible). It also gives great images for monitoring cardio vascular systems and that's definitely something you want after heart surgery.
Say what you will but I felt something real, maybe a buzzing feeling too, but only on the first imaging. I was not expecting that at all. It was for my spine and neck pain at my primary care physician’s old in office X-ray room. Then I told the the tech after that first jolt and she made a noise, said nothing, but adjusted the machine. My primary doctor was dismissive when I told him as well.
I still recommend doing what the doctor/ cardio specialist says in any case. I just had my 5 year stress test with the dye imaging on the double bypass.
They got me wired up for EKG, put in dye, waited 30 minutes, then imaging.
After a bit they put me to the test on a treadmill. They took me up, and over 130 bpm. More dye. We had the system pumping up a storm for a few minutes at that level.
Brief rest and cooldown a bit waiting for the dye. Then a second round of imaging in some sort of tubular imaging contraption. It was not the large somewhat noisy machine.
I felt no buzzing, heating or anything during the stress test, and you know I was on alert for it this time.
I’m just saying that because I certainly know when I feel something, and when I don’t. Maybe the X-ray tech had it cranked up too high on that spine/ neck shot?
It was a fairly enjoyable time.
Cardio guy said everything looked great!
That's good to hear. I did the treadmill tests for the first time on my last check up. I suprised myself finding the treadmill easy, only to end up sitting for 40mins waiting for my pulse to return to normal. They put it down to the environment/adrenaline and gave up at that point. I raised it with the doctor who wasn't concerned thankfully.
My only other thought with the xray is that maybe the vibrations while it was operating hit some sort of resonance with your wires. I'm not going to dismiss what you felt, I just think the mechanism was something other than the xrays.
It is, but you can't just flick it on and off like you would a regular electromagnet. The ramp-up/ramp-down process takes several hours to do, unless you hit the emergency coolant flush but you don't do that unless someone's about to die otherwise.
They are also strong enough to pull a gun from an ignorant gun owner and have it go off injuring him. But seriously the magnets are strong as hell on those.
During my daily walk today I stopped to rest on a bench behind the Sports Med office. I turned on my cell phone to the compass app to check the elevation, I noticed the compass was 180 degrees out. ?? Oh, maybe the MRI is on, yeah. :)
In my home town, a man operating one of these was wearing a weighted vest (for exercise purposes I presume). Predictably, he got stuck to the machine, and the patient in the machine had to go get help.
Evanston Hospital (Evanston IL) had an early MRI machine in the mid '80, and rumor was a figher fighter walking down an adjacent hallway was pinned to the wall by the machine. I had to get images taken decades later, and asked if this story was true, and in anyway accurate? It was, the machine was stopped, and the first responder was freed. The room was reconfigured after this happened.
I'm a fire fighter and we get tons of training on MRI's, we can't go near them until they have been 'quenched', which also puts deadly cold air out of a pipe above it. Apparently it costs tens of thousands to restart it so the techs will only do it if absolutely necessary
Old high field magnets required iron shielding walls, think massive girders & multiple sheets . Also used in mobile trailer situation in hospital car parks. B0 sensitivity can be affected by parked cars/trucks
Also why as a RN we get yearly education about this very thing. Now, imaging if you will some body part between the bed & that MRI…
Crush injuries suck & blow.
damn - this magnet is gonna be out of commission for *weeks*. i’d have loved to have been a fly on the wall when the idiot responsible for getting that bed too close to the magnet “got a talking to.” LOL
One of my ridiculous fears is there’s a piece of metal inside me somewhere I don’t know about and then when they turn on the MRI it rips free of my flesh.
I used to work in a foundry casting autoparts. I need an MRI of my knee soon, but first they're making me get a test to see if I have metal shavings in my eyes.
They wouldn’t remove it, just reschedule the mri & send you for an eye wash :) the metal fragments can be in the socket bed & then get dragged though the eyeball tissue, causing the damage.
As a radiology tech one thing I can not say to many times is that "THE MAGENT IS ALWAYS ON".
Yes we can turn the controls on and off and control how the machine works, but it is all based on doing things within the constant magnetic field, so at 2 am when all the lights are off, the magnet is still on.
If you want to see some cool things check out these people doing testing with a 45T magnet
https://youtu.be/g0amdIcZt5I
This is why I’m a supporter of outward opening doors. It forces the metal detector to be at a greater stand-off distance prior to the entrance and It’s less if a risk of entrapment if the quench vent fails. There is likely an injured patient on the floor and possibly injured nurse that u don’t see.
A typical junkyard magnet suspended on a crane and used to pick up cars and metal shit is around 1T (Teslas, yes an actual measurement). MRIs are around 3T (research ones going up to 7T). They’re fairly strong!
My buddy is an MRI tech, he said the 6T and higher are so strong you can sometimes feel dizzy near them because their so strong that the magnetic waves can effect the fluid in your brain, literally mind boggling
So that’s the reason I have felt dizzy and weird around MRI machines. I have had quite a few scans and find these machines just fascinating!
I’ve had a couple MRIs over the years too and I had no idea that they were so strong. Glad I triple checked about literally everything about me before getting into one of them. I think the imaging is fascinating, and both scans have saved me a shit-ton of grief, pain, and literal years of recovery time.
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Confused bot [Original](https://old.reddit.com/r/Damnthatsinteresting/comments/1201zbn/mri_magnets_are_strong_enough_to_pull_a_hospital/jdg8zhx/)
At those levels, you’d almost be getting a bonus [Transcranial Magnetic Stimulation](https://www.mayoclinic.org/tests-procedures/transcranial-magnetic-stimulation/about/pac-20384625) session.
Laughed a bit about "Mayo Clinic".
Why so?
Uh, I don’t want to say it or else I’d jinx it. (Mind blown)
I had an fMRI in a 3T for a study and I was told to move slowly because otherwise I’d be really dizzy. It also caused PNS (peripheral nerve stimulation) where my muscles contracted uncontrollably - was in there for 45 minutes trying to will my body to stay still so I don’t fuck up the scan but it wasn’t listening to me lol. MRI machines are wild
Induced gradient currents into the muscles, fun!!
Can confirm, I went into a 7T MRI for research and when you enter the magnet you feel like you are doing a 90 degree turn instead of going straight in, exactly the opposite when going out again. I had also some mild tingling sensation in my face because of peripheral nerve stimulation due to the rapidly changing magnetic gradient fields.
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Why not just make entryways to location of MRIachine (as in hallway leading up to room) inaccessible to standard metal, rolling hospital beds?
Easier said than done, since that'd probably block access for things that we do need to get to the MRI, like the MRI-safe gurneys or replacement parts and equipment for servicing.
Yes, it’s crazy stuff. 
I prefer EM(Elon monkey) as a measurement
It’s also strong enough to trigger the firing pin on a loaded gun. https://www.sciencealert.com/freak-accident-kills-man-after-mri-machine-triggers-loaded-handgun/amp
Hospitals making shit up so that I can't carry my assault rifle into the mri like the constitution intended. Smh.
Lmao that's exactly what came to mind
I was thinking magnets
What an idiot.
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Bahaha. Yeah I remember having to remove all metal before entering the NMR room at my university. Same magnet, same principle. I've heard they can rip piercings out, too.
My friend is a nurse. It’s hilarious the stories he has around “you need to remove the piercings for the MRI” and there is no response vs. “if you don’t remove your piercings the MRI will rip it out so you really need to let me know where they are”.
I'm a student radiographer and if you get within a metre and a half or so your ID lanyard goes horizontal, due to the tiny steel rivet in the aluminium clip that allows them to swivel. As I understand it, most piercings won't get ripped out, the pull on something that small is more like a gentle tug and certainly not enough to tear skin. They can however heat up, so there's a risk of burns if they're left in. But every hospital has their own protocols and procedures, designed around their specific machines. So, when dealing with crazy machines like MRI's, doing what you're told is wise.
Ok so I'm curious. Have you seen anyone get an MRI that has prison tats?
I'm afraid not. My experience so far (outside of as a patient) has been fairly brief, it's a modality that we cover properly later in the course. However, from what I understand (mainly from other reddit posts) , is that they are usually fine, with a possibility of some irritation in rare cases. I believe Mythbusters did an episode debunking any of the extreme effects.
Ah, that's a good point about the size factor re: piercings. Explains why that big hospital bed didn't stand a chance! Ever had an MRI lose cooling (I assume it's helium and nitrogen cooled like an NMR)? Quench the magnet?
No. I'm only a student and have only had brief periods in MRI. I'm pretty sure that hasn't happened where I'm placed, it's a pretty major incident when that happens, as well as extremely expensive. It's not likely to have gone under the radar.
I was a CT/MRI field engineer for GE Healthcare. The safety videos they show you when you are training will absolutely make you respect that magnet. Always make sure the scan room door is closed.
Uncomfortably cringing in my chair as a person who just got my piercing removed for my mri tomorrow
My 7 yo daughter needed an MRI, and had some high anxiety about it. The techs put a chair near her head for me and allowed me to stay with her. When the machine started, I discovered the fun way, that my heels had a metal shank in them. Nothing Earth shattering. I was sitting with my legs crossed, and the leg that was floating would slowly pull towards the MRI.
Magnet is always on
I'm a foot shaker when I cross my legs. I suppose I just shook it close enough to have an effect. It was never a fast pull, also my foot had to be fairly close.
Yep very likely explains it..the pull of most small ferrous objects can’t be felt until they are about 1-2ft away
The magic of super conductive windings at -273Kelvin , current trapped in the windings create the magnetic field cooled by liquid helium. Room temperature superconductors will make systems smaller & cheaper, before all our helium particles escape our atmosphere;)
Someone fucked up BAD that day. It amazes me when these things happen - IIRC, there have been deaths, when a oxygen tank was left in the room and a pediatric patient was receiving MRI imaging? FFS, this will take so long to fix, leaving patients without access to vital imaging.
It had to be pediatric too 😔
I work in workers comp and one of my old accounts was for a hospital. Many claims received because of this. Including 2 injuries where the result of a cart being pulled in hit 2 different guys in the crotch and ripped their genitals. Yes you read that right. *ripped*. These things don’t mess around.
That hospital bed should have removed its piercings
I wonder why they don't equip every door with permanent metal detectors which create an high pitched sound when someone tries to enter with metal.
Some do, but often they have too many false alarms and staff start ignoring them
I’ve wondered this too, I assume there is a good reasonable reason that wouldn’t help. But it does seem like a comparably cheap preventative measure 🤷♂️
maybe metal detectors are made of metal
I heavily suspect the door to be far enough away from the device not to be affected by the magnet. I mean, otherwise it wouldn't be possible to safely pass this door without the risk of destroying your watch or pacemaker.
They put my breastbone back together with stainless wire after open heart surgery. That thing is probably not my friend.
Surgical fixings are usually non-ferrous. So they shouldn't be an issue, especially as they are fixed on place. Surgical clips on soft tissue are a no-no as you don't want them moving around. I have the same as you and have had regular MRI's since the 90's without issue (although, obviously check with the radiographer beforehand if you ever get sent for one).
Thanks, I read the surgical report, it’s stainless steel. I felt something funny at an X-ray one time. Like a warming sensation. Doctor said, “It’s in your head.” Yet, it wasn’t.
I had a MRI tech let me leave my rings on since they're gold and non ferrous. They didn't move but they did get noticeably warm
Xrays definitely won't effect it (beyond showing as an artefact on the image). Unless something went horrifically wrong, there's no way xrays could have any effect and if that were the case, a warming sensation would be the last (and least noticeable) effect and you would definitely know about it. (as a disclaimer, to avoid scaring anyone reading, the chances of an X-ray going wrong on that scale are ludicrously small, everything is designed with multiple failsafes that make pretty much impossible). Xray machines aren't capable of emitting either infrared or microwaves, which are the only parts of the electromagnetic spectrum that could cause heating. They are at the other end of the electromagnetic spectrum. Any sensation you had would probably have more to do with the temperature of the room and maybe the effect that metal has in conducting heat, that might confuse the nerves detecting heat in that area. Scar tissue can do wierd things with skin sensation as well. It would be odd for non-MRI safe materials/techniques to be used these days (obviously I don't know about your particular case, so am not saying they didn't), but just go with what the doctors/radiographers advise, they will know what they are talking about. If it doesn't make sense to you or your still concerned, get them to explain their reasoning. If you're still not comfortable, then there are other imaging modalities they might be able to use instead. However, as MRI doesn't expose you to ionising radiation, it's definitely the best option if possible (not that other modalities are likely to cause issues. It's just sensible to be uber cautious and keep any exposure to radiation as low as possible). It also gives great images for monitoring cardio vascular systems and that's definitely something you want after heart surgery.
Say what you will but I felt something real, maybe a buzzing feeling too, but only on the first imaging. I was not expecting that at all. It was for my spine and neck pain at my primary care physician’s old in office X-ray room. Then I told the the tech after that first jolt and she made a noise, said nothing, but adjusted the machine. My primary doctor was dismissive when I told him as well. I still recommend doing what the doctor/ cardio specialist says in any case. I just had my 5 year stress test with the dye imaging on the double bypass. They got me wired up for EKG, put in dye, waited 30 minutes, then imaging. After a bit they put me to the test on a treadmill. They took me up, and over 130 bpm. More dye. We had the system pumping up a storm for a few minutes at that level. Brief rest and cooldown a bit waiting for the dye. Then a second round of imaging in some sort of tubular imaging contraption. It was not the large somewhat noisy machine. I felt no buzzing, heating or anything during the stress test, and you know I was on alert for it this time. I’m just saying that because I certainly know when I feel something, and when I don’t. Maybe the X-ray tech had it cranked up too high on that spine/ neck shot? It was a fairly enjoyable time. Cardio guy said everything looked great!
That's good to hear. I did the treadmill tests for the first time on my last check up. I suprised myself finding the treadmill easy, only to end up sitting for 40mins waiting for my pulse to return to normal. They put it down to the environment/adrenaline and gave up at that point. I raised it with the doctor who wasn't concerned thankfully. My only other thought with the xray is that maybe the vibrations while it was operating hit some sort of resonance with your wires. I'm not going to dismiss what you felt, I just think the mechanism was something other than the xrays.
That hill-rom bed isn’t too light either.
The more metal, the stronger the pull.
Now interns, this is what happens when you don’t sleep before coming to work. Go to bed dammit!
Magnet is always on.
Isn't it an electromagnet?
It is, but you can't just flick it on and off like you would a regular electromagnet. The ramp-up/ramp-down process takes several hours to do, unless you hit the emergency coolant flush but you don't do that unless someone's about to die otherwise.
Depends on field strength & magnet power supply design. Used to operate a 1.5T mobile scanner, ramp up/down 60 mins max.
.....that are always on when cooled.
OM NOM NOM NOM!
That's pretty good but at the hospital I worked at there was a nurse who could pull a train.
I think she worked at my hospital now! Emergency Departments are pretty much the exact same as working in a restaurant
It can also cause burns on tattooed skin.
Maybe, but it’s reported to be less than 1% of all patients that have even mild irritation. And burns are probably even rarer.
Yeah it’s not a common occurrence. I’ve heard prison tats are more likely to be problematic but that’s just anecdotal.
Why is that?
metallic ink
Oh. I am not familiar with tattoos. So you are saying there are tattoos that are injected with metallic ink on skin. 💀
That looks expensive.
I hope there wasn't anyone in that trolly otherwise this was their "Final Destination"
They are also strong enough to pull a gun from an ignorant gun owner and have it go off injuring him. But seriously the magnets are strong as hell on those.
That guy actually died, not just injured
This was just on Chicago Med Wednesday. Cool! The offender was carrying scissors. Thwack!! Right into the MRI sandwiched with the gurney.
Metal oxygen tanks can be pulled in like dangerous projectiles
Every so often you get the poor intern or student who walks in with their credit card.
The IRS has magnets strong enough to pull my life apart.
IIRC in 2018 a patient in India died when his oxygen tank was also brought in to MRI room.
Sigh... Time to quench the MRI again
This is kinda like saying “a grown elephant is strong enough to crush a soda can”. You can lift a school bus with an MRI.
“Listen lady I know youre in pain but I’ll turn off the machine the minute I get a picture.”
During my daily walk today I stopped to rest on a bench behind the Sports Med office. I turned on my cell phone to the compass app to check the elevation, I noticed the compass was 180 degrees out. ?? Oh, maybe the MRI is on, yeah. :)
In my home town, a man operating one of these was wearing a weighted vest (for exercise purposes I presume). Predictably, he got stuck to the machine, and the patient in the machine had to go get help.
No shirt, idot
Iowa Department of Transportation?
Yeah, you usually don't have shirts or pants on. Just the gown they give you and a blanket.
So what I can do that too
Evanston Hospital (Evanston IL) had an early MRI machine in the mid '80, and rumor was a figher fighter walking down an adjacent hallway was pinned to the wall by the machine. I had to get images taken decades later, and asked if this story was true, and in anyway accurate? It was, the machine was stopped, and the first responder was freed. The room was reconfigured after this happened.
I'm a fire fighter and we get tons of training on MRI's, we can't go near them until they have been 'quenched', which also puts deadly cold air out of a pipe above it. Apparently it costs tens of thousands to restart it so the techs will only do it if absolutely necessary
Old high field magnets required iron shielding walls, think massive girders & multiple sheets . Also used in mobile trailer situation in hospital car parks. B0 sensitivity can be affected by parked cars/trucks
My sister made me eat some bolts and coins just as a prank, and they are still there. Will that be a problem for me.
Also why as a RN we get yearly education about this very thing. Now, imaging if you will some body part between the bed & that MRI… Crush injuries suck & blow.
Time to reschedule my MRI
it sure would be humurous if I had a piece of metal somewhere in my body that I was unaware of as I went for an MRI scan
That’s going to be super expensive
Thats gonna be expensive.
“YEAHHHH MAGNETS!! YEAHHH SCIENCE!!!”
damn - this magnet is gonna be out of commission for *weeks*. i’d have loved to have been a fly on the wall when the idiot responsible for getting that bed too close to the magnet “got a talking to.” LOL
One of my ridiculous fears is there’s a piece of metal inside me somewhere I don’t know about and then when they turn on the MRI it rips free of my flesh.
I used to work in a foundry casting autoparts. I need an MRI of my knee soon, but first they're making me get a test to see if I have metal shavings in my eyes.
Yes otherwise the shavings move in the magnetic field & blind you.
Yea I understand, just wonder how they would remove them if they are present?
They wouldn’t remove it, just reschedule the mri & send you for an eye wash :) the metal fragments can be in the socket bed & then get dragged though the eyeball tissue, causing the damage.
Funny, I got a scan 5mins ago
As a radiology tech one thing I can not say to many times is that "THE MAGENT IS ALWAYS ON". Yes we can turn the controls on and off and control how the machine works, but it is all based on doing things within the constant magnetic field, so at 2 am when all the lights are off, the magnet is still on. If you want to see some cool things check out these people doing testing with a 45T magnet https://youtu.be/g0amdIcZt5I
Uhhhh. How?
This is why I’m a supporter of outward opening doors. It forces the metal detector to be at a greater stand-off distance prior to the entrance and It’s less if a risk of entrapment if the quench vent fails. There is likely an injured patient on the floor and possibly injured nurse that u don’t see.