Risks Magnetic resonance imaging

Magnetic Resonance Imaging - MRI

Because MRI uses powerful magnets, the presence of metal in your body can be a safety hazard if attracted to the magnet. Even if not attracted to the magnet, metal objects can distort the MRI image. Before having an MRI, you’ll likely complete a questionnaire that includes whether you have metal or electronic devices in your body.

Unless the device you have is certified as MRI safe, you might not be able to have an MRI. Devices include:

Metallic joint prostheses
Artificial heart valves
An implantable heart defibrillator
Implanted drug infusion pumps
Implanted nerve stimulators
A pacemaker
Metal clips
Metal pins, screws, plates, stents or surgical staples
Cochlear implants
A bullet, shrapnel or any other type of metal fragment
Intrauterine device
If you have tattoos or permanent makeup, ask your doctor whether they might affect your MRI. Some of the darker inks contain metal.

Before you schedule an MRI, tell your doctor if you think you’re pregnant. The effects of magnetic fields on fetuses aren’t well understood. Your doctor might recommend an alternative exam or postponing the MRI. Also tell your doctor if you’re breast-feeding, especially if you’re to receive contrast material during the procedure.

It’s also important to discuss kidney or liver problems with your doctor and the technologist, because problems with these organs might limit the use of injected contrast agents during your scan.

Because MRI uses powerful magnets

Because MRI uses powerful magnets


Hearing aids
Underwire bras
Cosmetics that contain metal particles
What you can expect
During the test

If you have a fear of enclosed spaces (claustrophobia), you might be given a drug to help you feel sleepy and less anxious. Most people get through the exam without difficulty.



In some cases, a contrast material, typically gadolinium, will be injected through an intravenous (IV) line into a vein in your hand or arm. The contrast material enhances certain details. Gadolinium rarely causes allergic reactions.

An MRI can last anywhere from 15 minutes to more than an hour. You must hold still because movement can blur the resulting images.


After the test
If you haven’t been sedated, you can resume your usual activities immediately after the scan.

A doctor specially trained to interpret MRIs (radiologist) will analyze the images from your scan and report the findings to your doctor. Your doctor will discuss important findings and next steps with you.

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