Functional magnetic resonance imaging (fMRI) is a relatively new procedure that uses MR imaging to measure the tiny metabolic changes that take place in an active part of the brain.
A magnetic resonance imaging (MRI) scan is a painless procedure that lasts 15 to 90 minutes, depending on the size of the area being scanned and the number of images being taken.epending on the size of the area being scanned and how many images are taken, the whole procedure will take 15 to 90 minutes. The MRI scanner will make loud tapping noises at certain times during the procedure.
How long does the MRI scan take? For most exams, expect to be in the department for a minimum of one hour. We need time to prepare you for your scan, and then take you into the room for the actual exam. For most body cases (exams like liver, pelvis, heart) expect to be in the department for two hours.ow long does the MRI scan take? For most exams, expect to be in the department for a minimum of one hour. We need time to prepare you for your scan, and then take you into the room for the actual exam. For most body cases (exams like liver, pelvis, heart) expect to be in the department for two hours.