An MRI machine consists of a very large and powerful magnet in which the patient lies. Magnetic signals or fields are sent into the body, and returning signals received to create an image. MRI is particularly good at looking at soft tissues – brain, spinal cord, nerves, ligaments, joints and muscles. It is less good at looking at bone, where CAT scanners are better.
The patient usually lies on a narrow table that moves into the MRI scanner. It is important that you lie very still when asked, because movement can cause blurring of the images. Whilst the magnet works you will hear loud hammering noises. This is quite normal and you do not need to worry. Sometimes a contrast agent is injected intravenously as part of the study. This improves the clarity of some types of MRI images. The time taken for an MRI varies depending on the series required. You should ask the staff before the procedure begins.
There are a few important things you need to be aware of before having an MRI. Some people find being enclosed in the smal space of the MRI scanner for a prolonged period uncomfortable and anxiety inducing. Doctors can give sedation if absolutely required. An MRI involves a powerful magnet and because of this some people with implantable devices should not undergo an MRI. This includes people with heart pacemakers, cerebral aneurysm clips, inner ear implants or metallic forieign bodies in delicate places such as the eye. Magnetic objects and objects afected by a magnetic field should be removed before having the scan. This would include watches, credit cards, jewellery, and so on.
Investigation of suspected brain or spinal cord problems. MRI may not be the first line investigation but is often required at some stage.
The MRI images are carefully reviewed and reported by a specialist radiologist. The report is then usually sent to the doctor who requested the investigation a day or two later. That doctor should go through the results with you, explaining what they mean and what the management plan should be.
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