Magnetic resonance imaging (MRI) is a type of scan that uses strong magnetic fields and radio waves to produce detailed images of the inside of the body. 

 

An MRI scan can be used to examine almost any part of the body, including the: 

• bones and joints  

• internal organs, such as the liver, womb and prostate gland  

• brain and spinal cord 

• breasts 

• heart and blood vessels 

 

An MRI scan can be used to help diagnose conditions and plan treatments. It can help with early diagnosis and getting you on a path to quicker recovery. 

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Safety 

An MRI scan is a painless and safe procedure. You may find it uncomfortable if you have claustrophobia, but most people are able to manage it with support from the radiographer. 

 

Most modern MRI scanners have a wider tunnel, which can help reduce claustrophobia. Going into the scanner feet first may be easier, although this isn't always possible. 

 

An MRI scan is one of the safest medical procedures available. 

 

But MRI scans may not be suitable in certain situations. For example, if you have a metal implant fitted, such as a pacemaker or artificial joint, you may not be able to have an MRI scan. 

 

Having something metallic in your body doesn't necessarily mean you can't have an MRI scan, but it's important for medical staff carrying out the scan to be aware of it. They can decide on a case-by-case basis if there are any risks, or if further measures need to be taken to ensure the scan is as safe as possible. 

 

You may need to have an X-ray if you're unsure about any metal fragments in your body. 

 

Before the scan 

On the day of your MRI scan, you should be able to eat, drink and take any medication as usual, unless you're advised otherwise. 

In some cases, you may be asked not to eat or drink for up to 4 hours before the scan, and sometimes you may be asked to drink a fairly large amount of water beforehand. This depends on the area being scanned. 

 

When you arrive, you'll be asked to fill in a questionnaire about your health and medical history. This helps the medical staff ensure you can have the scan safely. You'll then be asked to give your signed consent for the scan to go ahead. 

 

As the MRI scanner produces strong magnetic fields, it's important to remove any metal objects from your body. 

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These include: 

• watches 

• jewellery, such as rings and necklaces 

• piercings, such as ear, nipple and nose rings 

• dentures (false teeth) 

• hearing aids 

 

It's best not to bring any valuables with you to your scan. Depending on which part of your body is being scanned, you may need to wear a clinic gown during the procedure. 

 

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 headfirst or feet first. 

 

The MRI scanner is operated by a radiographer, who is trained in carrying out imaging investigations. They control the scanner using a computer, which is in an adjacent room. 

 

You'll 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. 

 

At certain times during the scan, the scanner will make loud tapping noises. This is the electric current in the scanner coils being turned on and off. 

 

You'll be given earplugs or headphones to wear. 

 

It's very important to keep as still as possible during your scan. 

 

The radiographer may ask you to hold your breath for a few seconds or ask you to follow other instructions during the scan. 

The scan lasts 15 to 90 minutes, depending on the size of the area being scanned and how many images are taken. 

 

After the scan 

After the scan, you can resume normal activities immediately.  

 

Your MRI scan needs to be studied by a radiologist (a doctor trained in interpreting scans and X-rays). This means it's unlikely you'll get the results of your scan immediately. A radiologist report will be completed within 72 hours of your scan. 

 

A copy of the report will be sent to your GP or clinician looking after you.