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​What happens during an MRI scan?

You will lie still on a table that slides into the inside of an MRI machine.

During the scan, you will hear the scanner’s repetitive thumping sounds as radio waves are used to scan your body. The disposable earplugs provided can help to block out the noise.

In certain conditions, injection of a special dye into a vein in your arm may be required so that the organs may show up more clearly. Allergic reaction to the dye, i.e. Gadolinium, is rare.

"Although the MRI machine may look intimidating, an MRI scan is a painless procedure. It may last 30 to 45 minutes, depending on the area being scanned." ​says Dr Albert Low ​​​Su Chong​, Senior Consultant, ​Department of Diagnostic Radiology, Singapore General Hospital (SGH), a member of the SingHealth​ group.

Should you feel claustrophobic and uncomfortable at anytime during the scan, you can communicate with the radiographer through a call bell and an intercom system.

The MRI machine is able to generate cross-sectional and three-dimensional images from almost every angle. A diagnostic radiologist will analyse these images and send a report to your doctor.

How to prepare for an MRI scan

Most MRI scans do not require you to fast and you may continue to take your medications.

However, you should inform the radiographer if you have any medical devices or metallic foreign objects in your body such as a pacemaker, cochlear implant, artificial heart valve, eye implant or foreign body, intra-uterine contraceptive device, artificial joint, or surgical clip. The MRI scanner’s magnet may interfere or interact with metallic devices.

In addition, make sure to inform your doctor if you are pregnant or suspect you may be pregnant. Depending on your specific situation, the doctor may recommend an alternative scanning method.

Keep these precautions in mind on the day of the scan:

  • Remove any jewellery, hearing aids or anything metallic from your body.
  • Do not apply makeup or use hairspray.
  • Remember to lie very still when told to do so. Any movement may result in blurry images.

For more information on wha​t is an MRI scan​​, see previous page.

Ref: R14​