The MRI window is at the end of standard broadcast wavelengths. Well, radios in trucks and short wave radios can interfere with the MR signal. While MR is considered to be inherently safe and non-invasive. It does not use ionizing radiation and is seen as safer than imaging modalities that use x-rays, gamma rays, and positrons. However, the effects from the strong magnetic fields and radio frequency electromagnetic energy need to be considered.
Some concerns are safety issues, others more of a nusiance.
Credit cards can be erased if they get too close to the magnet. Most hospitals now have alternative equipment that is made of aluminum or other non-ferrous materials. Vigilance is important when anyone enters the room. You do not want to preceed someone into the room who may ave a pair of scissors in their pocket. It can become a lethal projectile in the room as you approach the magnet.