An MRI (magnetic resonance imaging) uses a special scanning machine to take pictures of the inside of the body. The patient will lie still on the table inside the MRI machine while it takes pictures. There will be a rhythmic knocking sound during the scan, like a drumbeat. Some children are frightened by the sound. Parents are unable to stay in the same room during the test, however, a microphone and a mirror allow the parents and staff to always hear, see and talk to the patient.