MRI
Magnetic Resonance Imaging or MRI is a way of examining the organs and tissues in the body without the use of X-rays.
The MRI scanner uses a strong magnetic field, radio waves and an advanced computer to provide very clear and detailed images of any area of the body.
MRI scans are often used to examine joints, particularly for the common sports injuries affecting the knee. Scans can identify tendons, ligaments, muscle, cartilage and bone marrow and can help your doctor decide whether an injury needs surgery.
How do I prepare for the MRI?
In most cases you do not need to do anything to prepare for the scan. You can eat and drink as normal. If you are taking any medication, please continue to take this. If we do need you to do anything in preparation, we will send you information about this with your appointment letter.
We may ask you to change into a hospital gown if any metal fastenings, such as zips are on your clothes close to the area we are going to scan. This is because the fastenings may spoil the pictures. Alternatively you may wish to arrive wearing clothes without metal such as t-shirt, jogging bottoms and sports bra for ladies.
You will need to empty your pockets of any coins, as these may be pulled out by the magnet and fly into the scanner. You will need to take off your watch and take any credit cards or travel cards with magnetic strips out of your pockets. The scanner can affect these and stop them from working.
If we are scanning your head, you will need to remove any dentures that contain metal. Dental fillings will not affect the scan. Hairclips and wigs must also be removed if they contain metal.
What happens during an MRI scan?
During an MRI scan, you lie on a flat bed that's moved into the scanner.
Depending on the part of your body being scanned, you'll be moved into the scanner either head first or feet first.
The MRI scanner is operated by a radiographer, who is trained in carrying out imaging investigations. The radiographer will control the scanner using a computer, which is in a different room to keep it away from the magnetic field generated by the scanner.
You are be able to talk to the radiographer through an intercom and they'll be able to see you on a television monitor and through the viewing window throughout the scan.
The scanner will make loud tapping noises which is the electric current in the scanner coils being turned on and off.
You'll be given earplugs or headphones to wear.
The scan lasts 15 to 90 minutes, depending on the size of the area being scanned and how many images are taken.
How long will the scan take?
This depends on which part of your body is being scanned and the information that your doctor needs. The radiographer will tell you how long they expect your scan to take.
Most scans take between 20 and 30 minutes, although some can take an hour.
What happens after the MRI?
As soon as the scan is finished, you can go home, you can eat and drink as normal and resume your usual activities.
