Pistol stuck to MRI machine - GIF

[12L14]

„Party balloons” are filled with a „leftover” helium from MRI - not „fresh” one.

[NeiljohnUK]

„Party balloons” are filled with a „leftover” helium from MRI - not „fresh” one.

Still a waste, we have a Helium recovery and repurification plant that runs 24/365 to capture and recycle Helium used, as in an MRI scanner, for superconducting magnet cooling, one of my jobs is topping up and and recovery of Helium in some of those units. Many of the cylinder suppliers here use the same grade of Helium as they sell for other industrial uses for 'balloon gas', recovered or "left-over" Helium gets fed into their bulk supply for all uses once cleaned up.

[hemmjo]

Well this is interesting reading . I was not aware of these facts.

Specifically the last section on that page; (bold added my me)

How Does An MRI Machine Use Helium
An MRI machine contains coils, a magnet and wires that conduct current. The machine uses a great deal of energy because of its large magnetic field. In order for it to use that much energy, it must be super conductive. For this to occur, wires inside the machine need to be reduced to a temperature of near zero degrees. The machine requires a substance in order for it to maintain a cold temperature, and that substance is liquid helium. The wires continuously are doused with liquid helium. The fluid has a temperature of -269.1 degrees Celsius, which is the equivalent of -452.11 Fahrenheit. The average MRI machine utilizes 1,700 liters of helium. A standard 18″ balloon requires about .1 oz of helium, and the machine uses about 56,100 oz to give you a mental picture of how much helium that is. The amount of helium in the scanner must be topped off on a regular basis, which increases the amount of helium used by the machine even further.

Unfortunately, the amount of helium on earth is diminishing due to its heavy usage, and it floating away. There isn’t much of it on earth because it’s not weighed down to the atmosphere. It’s slowly, but continuously, floating off into space. The noble gas is unable to be synthesized and is usually made through natural radioactive decay. Once the helium is gone, it’s gone forever because it’s a nonrenewable resource. The medical field requires a large quantity of helium to assist patients with diagnosing and monitoring their condition, which is by far a vital and valued use.

[mklotz]

Advancing technology can eventually decrease the use of liquid helium to achieve superconductivity. There are already room temperature superconductors, albeit at extreme pressures too high to be practical...

https://www.unlv.edu/news/release/lo...om-temperature

There are many superconductors...

https://en.wikipedia.org/wiki/List_of_superconductors

The engineering tradeoffs include more than the temperature needed to go super. If a superconductor is exposed to too high a magnetic field it will crash. This effect limits the amount of current a superconducting wire in an electromagnet can carry.

I'm reasonably confident that we'll be able to build an MRI in the next decade or two that can operate on liquid nitrogen temperatures.