Long Island man wearing 9kg-metal necklace dies after being sucked into MRI machine
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Isn't it an electomagnet?
it costs about thirty grand in helium every time you push it.
Oh, right, i forgot human lives have a price in the US.
Its a superconducting magnet that cannot be instantly shut off. I am sorry that the physics of this makes you so angry.
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Yah the guy was 61 so it’s unlikely that Darwin would figure into the consequences.
People misuse the term "Darwin Award" a lot. It doesn't just mean someone died in a dumb way, it means they died in a dumb way before passing on their genes.
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Depends on the machine type. Closed bore machines (the vast majority) use supercunducting electromagnets that are surrounded by liquid helium that creates a very strong magnetic field. To demagnetize them requires dumping the helium.
Some open bore machines use electromagnets, but they're much less common and not as powerful.
So the helium itself becomes magnetized, is that it?
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It's both! MRI magnets are electromagnets that are cooled down to 4 Kelvin using liquid helium. Once they reach those low temperatures, they become superconducting. This way, the magnet isn't gobbling up tons of electricity to stay at the desired field strength. Instead, the liquid helium needs to be replenished occasionally to keep it at superconducting temperature. Source: I work with MRI scanners.
TIL, thanks
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Its an electromagnet that they have cooled down to 4 Kelvin with liquid helium. They take time to 'wind up' aka 'ramping up to the desired/max field strength capable of the magnet'. They do this slowly because the magnet itself can crack if done too quickly, and many components are still affected by the strong magnetic field due to Lorentz forces. Also many components may be classified as 'non-magnetic' but still have some small amount of magnetism and can move when subjected to the extremely high magnetic fields. So, if the magnet is 'quenched' (all the helium shot out through a tube in the roof) then that process occurs in reverse, VERY quickly, potentially destroying many things. So its not like 'cutting the power' because the power is stored around the magnet itself by supercooled components creating a superconducting situation. Nonetheless, in case of harm coming to a person, techs should absolutely hit the quench switch. Not sure what happened to allow this guy in that room though
So not just an electromagnet. Thanks, TIL.
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It would probably be quicker for you to look it up yourself because the answer is complicated to explain. But it's an electromagnet made from superconducting materials, and that is why it seems to violate your common sense.
Others explained it fairily ELI5 in this thread, thanks.
It's not just an electromagnet is the TL;DR. -
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A 6 pound necklace…
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So the helium itself becomes magnetized, is that it?
No, the liquid helium cools the magnets to the point where they become superconductive. As to how that works exactly, I do not know. I don't think I have the math for it.
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A 6 pound necklace…
1kg =2.2 pounds. more like a 20 pound necklace.
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I'm just going through the comments spreading MRI information (source: work with MRI scanners). There is no radiation danger from MRI.
Just a very strong magnetic field that makes having ferrous objects on your person a hazardous thing to do.
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So the helium itself becomes magnetized, is that it?
the helium is liquid, which it only is when it is very very cold.
The superconductor will keep it's magnetic field forever, as long as it's superconducting, and it will stay superconducting while it is very very cold.There is physically no way (as in, it is simply impossible, due to how our world works, not money, not people, not technology) to instantly "switch off" the magnet.
it needs to go above a certain temperature, to lose it's superconducting nature, and it needs to do it at a pace that doesn't dump a GINORMOUS amount of energy in this magnetic field instantly, because that would be even worse.
the fault here is in allowing anyone with any magnetic metal anywhere near an MRI. And whoever let that happen is going to have a very bad week.
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This was not Mr. T.
This was Mr. D Capitated.
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Isn't it an electomagnet?
it costs about thirty grand in helium every time you push it.
Oh, right, i forgot human lives have a price in the US.
The US is an outlier in how it charges prices for healthcare services.
But every country in the world has prices charged for cold liquid helium. It's very expensive to gather, process, store, and ship, regardless of what kind of health care economics apply in your country.
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Just a very strong magnetic field that makes having ferrous objects on your person a hazardous thing to do.
I recently tried spreading the word to other MRI folks about the dangers of 'magnetic eyelashes', which i learned was a thing from my fiance. Kind of suprised we havent seen any incidents with those, thankfully.
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This was not Mr. T.
This was Mr. D Capitated.
Ooh mind you don't cut yourself on all that edge!
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The US is an outlier in how it charges prices for healthcare services.
But every country in the world has prices charged for cold liquid helium. It's very expensive to gather, process, store, and ship, regardless of what kind of health care economics apply in your country.
And in fact, doesn't the US have most of the world's supply of helium?
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Just going through comments spreading MRI information (source: I work with MRI scanners). Nothing is spinning inside the MRI machine. CT scanners have an internal spinning component, but MRIs do not.
Thank you, I actually did not know that. While we are at it: what is causing the sounds? And how often do those machines have to be calibrated, as I believe the RF receivers (?) have to be super sensitive and accurate.
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Why even wear the stupid necklace when going to the MRI in the first place? Like, how thoughtless and selfish can you be? Always assume you are surrounded by barely-functional morons, especially in the medical field which seems to attract these types of people, and think defensively.
"Geez, I'm going to be near an MRI machine, maybe I'll wear a 20 pound piece of steel around my neck? Genius! Let's do it!"
That's an extremely privileged take. Not everyone knows about what an MRI does. Don't just judge someone's education and circumstance like that.
Common sense is that a person should be able to trust the medical professional. If the professional doesn't properly warn them, how would they know?
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I'm not saying it's the husband's fault, but I don't think it's 100% on the technician either.
I read it more like she asked the technician to get her husband and called out to her husband who presumably just walked in.
Also, "they discussed the chain on a previous visit" doesn't really change anything. Depending on how many people that technician sees and when that last visit was, they might've just forgotten.
When McAllister entered the exam room with the technician, the machine suddenly “switched him around, and pulled him in,” Jones-McAllister said.
This was part of the other article I linked. It's a lot of "they said she said" but I'm gonna put more faith in the victim's word and not the clinic's.
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Carrying a 9kg necklace seems a bit silly. Though I suppose "for weight training" could just as well mean something medical, like needing to build up muscle mass after an operation.
What I need to know is: how is a man that was "not supposed to be in the room" specifically getting fetched by a technician to go into the room? I would have said "do not go past the antechamber" a dozen times on the way there. Did the wife calling out to him just turn off his brain, did the technician fail to inform him, or did they both not realise the metallic necklace was on him?
