To minimize demagnetization of the internal magnets, Medtronic recommends that the patient’s head is positioned along the long axis of the MRI system and that the patient is instructed to avoid head movement while lying on the patient table. If the head is tilted at an angle to the long axis of the patient table during a scan, the internal magnets may be demagnetized and a stronger external magnet may be needed to keep the device in place.