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MRI magnet quenching question

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Got asked a weird question today which I didn’t know the answer for and hoping someone here does know the answer. When an MRI undergoes an emergency quenching how fast does the magnetic field dissipate? For example if someone stupidly brought a metal air canister into the room and a person gets stuck between the canister and the MRI how quickly after initiating a quenching procedure will it be possible to pull the person free? Is it instantly? 30 seconds? Minutes?

submitted by /u/WhenDoesDaRideEnd
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source https://www.reddit.com/r/Radiology/comments/o6imlw/mri_magnet_quenching_question/
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