MRI (Magnetic Resonance Imaging)

MRI uses powerful magnets and radio waves to create detailed images of organs and tissues. Unlike CT scans or X-rays, MRI does not use ionizing radiation. Over 40 million MRI scans are performed annually in the US.

MRI is used to evaluate brain and spinal cord conditions, joint and musculoskeletal injuries, heart and blood vessel abnormalities, breast cancer screening (with mammography), abdominal and pelvic organs, and tumor detection and staging.

Remove all metal objects (jewelry, hearing aids, hairpins). Inform your doctor of any implanted devices (pacemakers, cochlear implants — some are MRI-conditional). You may fast for 4-6 hours for abdominal MRI. A contrast agent (gadolinium) may be injected for enhanced imaging.

You lie still on a table that slides into a tube-shaped magnet. The machine makes loud knocking and buzzing sounds — earplugs or headphones are provided. The scan takes 30-90 minutes depending on the area being examined. Open MRI is available for claustrophobic patients.

No recovery time is needed. You can return to normal activities immediately. If sedation was used, you will need a driver. If contrast was used, drink extra water to help flush it from your body.

MRI is very safe with no radiation exposure. Risks relate to the strong magnetic field (danger with certain implants), gadolinium contrast reactions (rare), nephrogenic systemic fibrosis (very rare, in patients with severe kidney disease), and claustrophobia/anxiety.

Alternatives include CT scan (faster, uses radiation, better for bones and acute bleeding), ultrasound (no radiation, limited detail), X-ray (quick but limited), and PET scan (evaluates metabolic activity).

Covered by insurance when ordered by a physician for a medical indication. Prior authorization is often required. Out-of-pocket costs depend on your plan. Freestanding imaging centers often charge less than hospital-based facilities.