Hello, An MRI will not affect your filler as it does not contain any metal that may be moved by the strength of the MRI. Typically, a patient lays on their back for a long period of time while images are taken, so an MRI should be avoided immediately after placing filler as you ideally want to remain upright for at least 4 hrs following filler placement. Additionally, no constrictive band should be placed to location where fill has been placed in the last 1-2 weeks as the filler is still mobile during that time, but an MRI does not typically involve a constrictive band.