Magnetic Resonance Imaging (MRI)
What is Magnetic Resonance Imaging [MRI]?
MRI is a scanning technique that can produce very clear, detailed pictures of your brain (and other parts of the body). These pictures are very much more detailed than those produced by other scanning techniques. They can help your doctor/s to see whether there is a structural cause for your epilepsy.
It is very important that you understand that MRI is a diagnostic tool and not a form of treatment.
How does MRI work?
MRI uses a very strong magnetic field to scan the hydrogen protons within your body. Very sophisticated electronic hardware and computer software combine to produce images onto a computer screen and also onto films that are then available to your doctor/s for examination.
Why are these scans so helpful in relation to epilepsy?
Because an MRI produces such specific anatomical details, this has meant that minute abnormalities [undetectable by other scanning methods) are made visible. This enhances the possibility of a neurosurgeon being able to pinpoint and remove an abnormal area.
Does an MRI produce side effects?
MRI is not known to have harmful side effects. However, it is not possible for people with pacemakers, cerebral aneurysm clips and some other surgical implants to have an MRI on account of the strong magnetic field.
What happens before an MRI scan?
Preparing for your scan is simple. You can eat normally and you should take any prescribed medication. Plan to arrive at the centre 15 - 20 minutes earlier than your appointment time, and expect to be at the MRI centre for at least an hour.
What happens during an MRI scan?
Various information is gathered from you to make certain that there is no reason to deny you the scan. Some of the questions you will be asked may include:
- Do you weigh 136 kgs or more?
- Can you comfortably lie flat?
- Do you suffer from being in enclosed spaces?
- Are you/could you be pregnant? MRI scans are generally not recommended for pregnant women.
- Do you have any medical devices such as
- Cardiac pacemaker
- An IUD containing copper
- Cerebral aneurysm clip
- Metal implants or other surgical clips
- Neurostimulators
- Hearing aid/s
- Do you have any metal shrapnel in your body or metal fragments in your eyes?
Metal causes interference with the MRI machine and their presence during an MRI may cause injury to you. It is vital that you tell the staff.
You'll be asked to remove all jewellery, hairclips, hearing aid/s, non-permanent dentures, makeup, credit cards, keys, coins, - in fact anything in your pockets that might interfere with the scanning process. The MRI centre will provide you with a safe place for your belongings.
You may be asked to change into a hospital gown and will then be escorted to the examination room.
You'll then be asked to lie on a flat, moveable bed that will move inside the scanner, which looks like a huge metal doughnut. You will not be completely enclosed even though it is a relatively small area.
The scanning process is very noisy. Earplugs are available and there is also the opportunity to listen to your favourite CD or tape. A two-way intercom allows you and the technician to be in constant contact.
The scan itself usually takes about 30 minutes. All you have to do is lie still!
When will I get my results?
The MRI images will be reviewed by a Radiologist who will send a report to your referring doctor within a few days. These two doctors will discuss your results. Your doctor will then be in touch with you to discuss a course of treatment based on your medical history, the MRI report and any other test results.
Do I need a referral?
Yes you do, and it must be from a specialist.
Any more questions?
If you feel that this diagnostic technique would be helpful in relation to your epilepsy, contact your doctor to discuss the possibility.
Don't be shy about clarifying any areas of concern with your doctor or the MRI staff.
Further Information
Contact the Foundation
This bulletin was prepared by: Margot Boyle [EFV Inc]
And its contents reviewed and verified by: Assoc. Prof. Mark Cook [epileptologist] |
