78 comments on Goodbye Helium, Goodbye Brainscans
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78 comments on Goodbye Helium, Goodbye Brainscans
Comments can no longer be added to this story.
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AFAIK, it's not used in MRI machines yet. They do use cryocoolers instead of LHe in some machines.
For anyone who cares:
Some cryocoolers (specifically pulse-tube cryocoolers) use pressurized helium instead of liquid He. I installed a cryocooler in a lab a couple of years ago to cool a SQUID chip (superconducting-quantum-interference-device) used for magnetic imaging.
Because the He is in gaseous form and in a closed system, the loss rate is much lower than in traditional coolers where the devices used are basically "bathed" in the liquid form. We could still get this chip down to 3-4K with a power output of under 300mW which is pretty impressive.
Yay science!