MRI Safety Policies

An MRI machine

Magnetic resonance imaging, or MRI, is a technique that uses a magnetic field and radio waves to produce images of organs, tissues and bones. MRI scanners are used to diagnose brain tumors, spinal infections and to visualize torn ligaments.

Magnetic Field Risk

An MRI machine's magnetic field is very strong and can cause metal items to become airborne. A patient should remove all metals, including jewelry and hairpins.

Emergency Supplies

According to the University of California in San Francisco (UCSF), emergency medical supplies should be kept on a crash cart in the MR suite, which is in the unrestricted zone (an area outside of the MRI environment). A patient should be moved to this area if resuscitation is necessary.

Internal Devices

Metal in your body can affect the outcome of the image, according to the Mayo Clinic. If you have metal or electronic devices in your body, such as a pacemaker, shrapnel or metallic joint prostheses, you should inform the technologist.

Pregnancy

You should also inform the technologist if you may be pregnant. The Mayo Clinic warns that the effects of magnetic fields on unborn children are not conclusive. It may, therefore, be necessary to reschedule your MRI.

Acoustic Noise

UCSF also says "a significant amount of acoustic noise is created" during an MRI, which "can cause reversible or irreversible effects." To prevent this, all patients should wear earplugs or headphones.

References

• University of California--San Francisco: Magnetic Resonance Safety Policy of UCSF
• Mayo Clinic: MRI: How You Prepare