dialysis x1 for MRI?

I don't know anything about dialysis so I may be way off, but do they ever do dialysis right after a MRI with contrast for someone with a reduced renal function? I have a friend who is sitting there on hold in hopes that her kidney function improves before she can have an MRI to see if a tumor in her brain is cancer. It seems to me like there has to be some way to get her this MRI faster.
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