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A magnetic resonance imaging (MRI) scan is a painless procedure that lasts 15Â to 90 minutes, depending on the size of the area being scanned and the number ofÂ images being taken.
On the day of your MRI scan, you should be able to eat, drink and take any medication as usual, unless advised otherwise.
In some cases, you may be asked not to eat or drink anything forÂ up to four hours before the scan, and sometimesÂ you may be asked to drink a fairly large amount of water beforehand. This depends on the area being scanned.
When you arrive at the hospital, you'll usuallyÂ be asked to fillÂ in a questionnaire about your health and medical history. This helps the medical staff to ensure you have the scan safely.Â Read more about who can and can't have an MRI scan.
Once you've completed the questionnaire, you'llÂ usually be asked to give your signed consent for the scan to go ahead.
As the MRI scanner produces strong magnetic fields,Â it's important to remove any metal objects from your body, including:
Any valuables can usually be stored in a secure locker.
Depending on which part of your body is being scanned, you may need to wear a hospital gown during the procedure. If you do not need to wear a gown, you should wear clothes without metal zips, fasteners, buttons, underwire (bras), belts or buckles.
Some MRI scans involve havingÂ an injection of contrast dye. This makes certain tissues and blood vessels show up more clearly andÂ in greater detail.
It's possible for contrastÂ dye to cause tissue and organ damage in people with severe kidney disease. If you have a history of kidney disease, you mayÂ be given aÂ blood test toÂ determine how well your kidneys are functioning and whether it's safe to proceed with the scan.
You should also let the staff know if you have a history of allergic reactions or any blood clotting problems before having the injection.
An MRI scan is a painless procedure, soÂ anaesthesia (painkilling medication)Â isn't usually required. If you're claustrophobic, you canÂ ask forÂ a mild sedative to help you relaxÂ â€“Â you shouldÂ ask your GP or consultant well in advance of having the scan.
If you decide to have aÂ sedative during the scan, you'll need to arrange for a friend or family member to drive you home afterwards, as you won't be able to drive for 24 hours.
General anaestheticÂ is often used when young children andÂ babies haveÂ an MRI scan. This is becauseÂ it's very important to stay still during the scan, which young children and babiesÂ are often unable to do when they're awake.
An MRI scanner is a shortÂ cylinder that's open at both ends. You'll lie on a motorised bed that's moved inside the scanner. You'll enterÂ the scanner either head firstÂ or feet first, depending on the part of your body being scanned.
In some cases, a frame may be placed over the body part being scanned, such as the head or chest. This frame contains receiversÂ that pick up the signals sent out by your body during the scan and it can helpÂ to create a better-quality image.
A computerÂ isÂ used to operate the MRI scanner, which is located in a different roomÂ to keep itÂ away from the magnetic field generated by the scanner.
The radiographer operates the computer, so they'll also be in a separate room to you. However, you'll be able to talk to them, usually through an intercom, and they'll be able to see you at all times on a television monitor.
While you're havingÂ your scan, a friend or family member may be allowed to stay in the room with you. Children can usually have a parent with them. Anyone who stays with you will be asked whether they have aÂ pacemakerÂ or any otherÂ metal objects in their body. They'll also have to follow the same guidelines regardingÂ clothing and removing metallic objects.
To avoid the images being blurred, it's very important to keep the part of your body being scanned still throughout the whole of the scan until the radiographer tells you to relax.
A single scan may take from a few seconds toÂ three or four minutes. You may be asked to hold your breath during short scans. Depending on the size of the area being scanned and how many images are taken, the whole procedure will take 15 to 90 minutes.
The MRI scanner will make loud tapping noises at certain times during the procedure. This is the electric current in the scanner coils being turned on and off. You'll be given earplugs or headphones to wear.
You're usuallyÂ able to listen to music through headphones during the scan if you want to, and in some cases you can bringÂ your own CD.
You'll be moved out of the scanner when your scan is over.
An MRI scan is usually carried out as an outpatient procedure. This means you won't need to stay in hospital overnight. After the scan, you can resume normal activities immediately.
However, if you've had a sedative, a friend or relative will need to take you home and stay with you for the first 24 hours. It's not safe to drive, operate heavy machinery or drink alcohol for 24 hours after having a sedative.
Your MRI scan needs to be studied by a radiologist (a doctor trained in interpreting scans and X-rays) and possibly discussed with other specialists.Â This means it'sÂ unlikely you'll know the results of your scan immediately.
The radiologist will send a report to the doctor who arranged the scan, who will discuss the results with you. It usually takes a week or two for the results of an MRI scan to come through, unless they're needed urgently.
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