An MRI scanner subjects body piercing jewelry to ferromagnetic torque, RF-induced current, and susceptibility artifacts. This is the clinical physics of what happens inside the bore, and why titanium, niobium, and glass retainers are the safer choices.
Read the full article: Body Piercing Jewelry and MRI Safety: Ferromagnetic Torque, RF Heating, and Imaging Artifacts
From Poli International, body art material science and safety. poliinternational.com