The primary safety concern when operating an MRI system is:

The primary safety concern when operating an MRI system is the static magnetic field. This strong, constant magnetic field is always present and poses unique safety challenges. It can attract ferromagnetic objects with considerable force, potentially causing harm to patients and staff. Objects such as oxygen tanks, metal tools, and even personal items like cell phones can become dangerous projectiles if they enter the magnet's field.

Furthermore, the static magnetic field can also cause concerns regarding patient safety, particularly for individuals with implanted medical devices, such as pacemakers, cochlear implants, or certain types of metal clips, which may not be MRI compatible. These devices can malfunction or be displaced due to the strong magnetic field.

While the gradient magnetic fields, radiofrequency energy, and acoustic noise associated with MRI procedures are also relevant safety considerations, they do not carry the same level of immediate danger as the static magnetic field. Ensuring a safe environment around the MRI machine involves a thorough understanding of the implications of the static magnetic field and stringent adherence to safety protocols.