The bore (the inner “doughnut” sized opening) of the magnet is 4 feet in length forming a hollow “tube” in which the patient is placed for the MRI examination. We get the best images when the body part to be examined is placed as close to the middle of the magnet bore as possible. In most MRI exams a significant part of your body is still outside the bore, however, because the magnet is so powerful, even though we may be just scanning your head, it is still very important that no metal is present on any part of your body.