What
is magnetic resonance imaging (MRI)?
An MRI scan uses magnetic fields to take
images of the brain. It can find scars,
tumours or areas of damage to the brain,
which may cause a person’s epilepsy.
Because an MRI scan uses strong
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.
The magnetic fields mean that if you have a
heart pacemaker or any surgical implant that
contains metal you may not be able to have an MRI scan.
What
happens during an MRI scan?
The scanner makes a loud noise so before it starts you will be given earplugs to wear. You will also be given a buzzer to hold - you can use the buzzer to let the technician know if you are feeling uncomfortable or
unwell during the scan. The technician is usually on the other side of a window in another room during the scan, but an intercom means you can talk to them. There is also usually a mirror inside the scanner so
you can see the technician during the scan. You may be able to have someone in the room with you during the scan.
During the scan you will lie on a platform which slides backwards into the scanner. When having an MRI scan to help diagnose epilepsy the scan usually takes about 30 minutes. Lying still during the scan is important so that the machine can take a clear image.
An MRI scan is usually a series of short scans with breaks in between rather than one long scan. Between each short scan the technician might use the intercom to check that you are comfortable.
More
information on diagnosing epilepsy
UK
Epilepsy Helpline: 01494 601400
Monday - Friday 10am - 4pm
©
The National Society for Epilepsy
July 2007
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What
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