MRI Magnet Quench - Helium Cryogen Release

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See what happens when you press the magic red button on a 1.5 Tesla Siemens MRI Scanner being decommissioned.

#radiology #NRTW #mri #quench #helium #science #imaging #siemens #magnet

Brendan McDowell

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Quenching is done in emergencies to quickly shutdown the magnet of the MRI. Doing so produces a vast amount of gaseous helium at too high a rate to condense and too high a total volume to store without massive infrastructure. That is why it’s vented into the atmosphere here.

drew

Well, that takes care of the “spiders in the vent” problem 😂

MasterPrimeape

There must have been a pretty good reason to do this... That is normally an emergency procedure. Otherwise somebody is going to pay for the loss of patient procedures and helium. It often is about 500 liters of liquid helium which greatly expands to many cubic feet of gas. I have worked on several of these magnets and never have I pressed that button . The newest of these magnets are able to use almost no helium. So they are really trying to reduce the usage of our finite resource.

I guess another note on the demo video aspect of this. is that helium is an oxygen displacer. Showing the gas expanding is also a warning to get out you could suffocate if you stay in a confined space. Most Magnet rooms do have O2 sensors to alert staff to get out! The expanding gas is also an indicator.

guym

I still can't believe all that helium can't be recycled especially considering the world wide helium shortage.

johno

interesting
hope no one had an iphone there lmao

stimpyfeelinit

Imagine if his hand got pulled in by the vacuum, can’t believe he did that.

junianius

I took the question as to why would you do this.... Not why they did this in this video... The only valid reason I could think of is a demo video... The person was way to calm to have an emergency situation. As someone else Last day on the job. Although there may be a pretty good lawsuit for playing a game like that... Its a few days to get an order of liquid helium at about 20K a day in lost patient revenues and undiagnosed patient conditions the facility wouldnt be smiling as much as she was.

guym

My neighbor works on these. He's got tons of stories about things gone wrong on them. And usually, when things have gone wrong, they go wrong big time, usually costing huge amounts of money and often a life.

ElementofKindness

they were just beginning to answer the question I always had. These magnets are "charged up" and then continue to have current flow with power disconnection for years ?

OldePhart