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MRI (Magnetic Resonance Imaging)

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MRI (Magnetic Resonance Imaging)

An MRI scan looks at the structure of the brain and may help to find the cause of your epilepsy. During the scan, detailed pictures are produced using strong magnetic fields. Because of the magnetic fields, metal objects in or near the machine can affect, or be affected by, the machine.

Before having an MRI scan you will need to remove any metal objects such as jewellery, hearing aids, coins or keys. If you have a heart pacemaker or any surgical implant that contains metal you may not be able to have an MRI scan.

The scanner makes a loud knocking noise, so before it starts you will be given earplugs to wear. You will also be given a buzzer to hold so you can let the technician know if you are uncomfortable or feeling unwell during the scan.

The technician is usually on the other side of a window in another room during the scan. There is an intercom so you can talk to them and a mirror so you can see them. You may be able to have someone in the room with you during the scan.

Having an MRI scan to help diagnose epilepsy usually takes about 30 minutes. During the scan you will lie on a platform which slides into the scanner (a bit like going into a tunnel).

It is important to lie still during the scan so that the machine can take clear pictures of your brain. An MRI scan is usually a series of short scans with breaks in between, rather than one long scan. Between each scan the technician might use the intercom to check that you are ok.

Information updated: October 2021

Functional MRI

In the last 20 years we have been using functional MRI (fMRI) at Epilepsy Society's Chalfont Centre to map where different functions such as language and vision occur in the brain.