300 Longwood Avenue Boston, MA 02115 (617) 355-6000 For Patients & Families: Waltham Virtual Tour: MR Imaging Our new magnetic resonance imaging (MRI) unit provides a high-tech look at the inside of a child's body. The large, doughnut-shaped machine (the magnet) takes up most of the room. During the test, a child usually lies on his or her back on the firm couch, which is then moved into the middle of the magnet. Control Room The doctors and radiographer operate the MRI from the control room. A speaker and microphone on the inside of the scanner enable the staff to communicate with patients inside. If a child has a question during the procedure, he or she can call the control room by pressing a call button.   Next: Diagnostic Radiology The information on this website should not be taken as medical advice, which can only be given to you by your personal health care professional. Copyright © Children's Hospital Boston. All rights reserved.