Debating to be pierced

[24m] Hello, I have been interested in either getting A frenulum piercing or a PA but had concerns in terms of what I do for work. I work in health care and at times can take people to get an MRI (magnet machine). My question is, is if I am to get a piercing it it possible to have a non metal one? Or do I have to have a metal one until it heals?