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You're not counting the materials costs. I doubt that medical grade helium is cheap.
True. I don't know how much that is. But liquid helium shouldn't be "medical grade" really. It's just a coolant for the superconducting magnets, same as any industrial use.
I presume that it has to be certified and probably heavily filtered. It's not going to be the same as what goes into party balloons.
Liquid helium is -269 °C. There is no risk of confusing it with what's in balloons.
And its a medical setting which means that the products you use will be certified and calibrated in just the right way.