So far this material (and pretty much all liquid nitrogen ones) can't be used to create MRI sort of fields. There's a reason they all stick with liquid helium.
Superconductors also have points where they stop superconducting because of the strength of the magnetic field or amount of current. YBCO and similar have these points below the useful level for MRIs.
There's research around finding ways to use them but nothing that is currently viable.
