Are MRI's Safe Following Breast Reconstruction with Areola Tattoo That Contain Iron Based Inks?

I have Natrelle 410 implants in both breasts(real and reconstructed). I was told to have any needed MRI's prior to the areola tattoo procedure because the iron based ink would create burning.I might need an MRI in the future (leakage over time or trauma such as auto accident with airbag deployment). What type of restrictions, and/or limitations are there after the tattoo procedure with respect to MRI's? Is the MRI safe? Does the answer change based on how long the tattoos have been in place?