Functional Magnetic Resonance Imaging (fMRI)

Also known as: fMRI

What is functional magnetic resonance imaging?

Magnetic resonance imaging (MRI) uses a magnet, radio waves and a computer to produce detailed pictures of organs of the body. The Functional magnetic resonance imaging (fMRI) technique is a form of magnetic resonance imaging that is used to map out the areas of the brain which are responsible for movement, sensation, vision and language/speech. The fMRI technique also has the potential to provide insight into neurologic and psychiatric disorders by showing brain activity.

What happens during the procedure?

The procedure for functional magnetic resonance imaging is quite similar to that of a standard MRI. The patient lies on a table, and is moved into a cylindrical machine (the magnet) that creates images of the patient’s brain. The patient’s head will be placed inside a brace to help it hold still during the test, while he/she will be instructed to do simple tasks like moving a finger or listening to a story. 

Is any special preparation needed?

The patient will need to avoid wearing anything metal, including jewelry, during the test, and depending whether sedation is used or not, may need to avoid food or fluids for a time before the examination. 

What are the risk factors?

As no radiation is used in this study, there are essentially no risks-if sedation is used, there are the usual risks associated with this.

Reviewed by: Jack Wolfsdorf, MD, FAAP

This page was last updated on: September 16, 2025 12:46 PM