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.
An MRI usually takes 30 to 60 minutes but can take as long as 2 hours. How It Feels. You will not have pain from the magnetic field or radio waves used for the MRI. The table you lie on may feel hard, and the room may be cool. You may be tired or sore from lying in one position for a long time.