what element is used in mri
Helium-3 is a very rare helium isotope, and you can do MRI/NMR of it. But that is not what happens in typical MRI of humans, as they don't contain any measurable amount of helium-3 (though there seem to be more exotic experiments that use it).he vast majority of helium used in MRI is for cooling, not as an imaging nuclei, to the point that I wasn't aware it was even used in that manner (but if Wikipedia says it, it must be true). The vast majority of helium on the planet is $He^4$, not $He^3$. â Colin McFaul Dec 11 '12 at 16:35.