It’s better than the title implies. They also broke the MRI machine because they hit emergency stop buttons instead of stopping for a couple seconds to ask how to safely handle removing the gun.
(I’m not sure the cost difference between a graceful shutdown and an e-stop and can’t find information, but if it’s 250k worth of fix, I’m betting it’s significant.)
Yeah, and the magnet was not to blame for this incident despite how the title of this article reads. Given all the (alleged, I guess) facts of the case, I’m pretty sure sure the cops showed up in a clown car that played Yackety Sax when the horn was pressed.
My uncle is a medical equipment installer that installs and calibrates MRI machines.
The issue is more than just the physical damage, which can be expensive, these machines take a long time to calibrate to the local environment. If the electromagnets are damaged, the whole set needs to be replaced, as they are manufactured in matching batches.
It’s like if you damage a piston in an engine, it will cause damage to the crank shaft, which will also damage the rest of the engine. It’s a helluva job to fix.
IIRC the emergency stop vents the liquid helium, that’s a lot of the cost I imagine.
The biggest problem is that the magnets will “quench”, which is what happens when a superconducting electromagnet suddenly stops being superconducting.
There’s a lot of energy stored in that magnet, and when it quenches the energy all turns to heat in a very short time. Any remaining helium will flash boil, turning into an explosive expansion of gas, and the thermal shock will seriously damage the machine
Which, in older machines, might happily pump a fuckton of gaseous helium into the room, potentially creating overpressure and squeezing the door shut while people suffocate.
Yeah. The magnet quench flash boils a bunch of helium which is itself expensive, and presents a nice asphyxiation hazard as well. And then, assuming the quench damaged nothing, you have to set up the magnet again by getting the coils back down to superconducting temperatures… to get there, you end up boiling off a lot more helium. And then you have have to bring an engineer in to get the electrons spinning through the coil again and wait for the wobbles in the current to stabilize.
Or so I think. I work with NMR spectrometers and not MRIs, but it’s essentially the same technology.
There’s also a finite supply of helium/liquid helium and …it ain’t cheap to refill.
