What is an MRI scan?

A magnetic resonance imaging or MRI scan is a diagnostic procedure where powerful magnetic fields and radio waves are used to produce detailed images of the body. Doctors use MRI scans to diagnose a variety of medical conditions, from damaged ligaments to cancers.

An MRI scanner is a tube-shaped machine that houses a large powerful magnet. It captures multiple images of the body from various angles which are transmitted to a computer. These images are used by doctors to determine the cause of the patient’s condition and to create a suitable treatment plan.

What happens during an MRI scan?

Before undergoing an MRI scan, the patient is requested to remove any metal jewellery or accessories as they will soon be exposed to a large magnet. Even the smallest metal object can interfere with the MRI machine. The patient is made to lie inside the scanner. The machine is turned on and the patient is asked to remain completely still during the scan. The captured images are processed and sent to the requesting doctor.

If the patient is anxious about enclosed spaces, they may be given medication to make the procedure more comfortable. It is important to remain very still during the scan as even the slightest movement can disrupt the images. Some patients may require an injection of contrast dye to make a particular tissue more visible during the scan. People with internal metal objects such as steel plates, screws, cochlear implants, pacemakers, aneurysm clips and other foreign objects should not undergo MRI scans.

What are the uses of an MRI scan?

An MRI scan can be used to:

• Detect abnormalities in the brain and spinal cord
• Identify injuries or abnormalities of the joints
• Detect diseases of abdominal organs
• Detect cysts, tumours and other abnormalities
• Screen for breast cancer
• Determine uterine abnormalities in women
• Evaluate pelvic pain in women, caused by endometriosis and fibroids