A magnetic resonance imaging test (MRI) uses magnetism and radio waves to create a detailed image of what the doctor needs to see inside your body -- such as tumors, injuries, infections, and more. There are certain precautions and preparation tasks that you will need to be aware of before the test. MRI magnets may react with any metal in your body, including pacemakers. Discuss these risks with your doctor. Follow the links below to find WebMD's comprehensive coverage about how an MRI is done, what an MRI scan looks like, what to expect, and much more.
What Is a MRI? What Happens When I Get One?
A MRI is a test your doctor can use to diagnose and monitor different conditions. Find out why you might need this test and how it works.
Making the Diagnosis of Alzheimer's Disease
WebMD provides an overview of diagnostic tests for Alzheimer's disease.
Diagnosing Multiple Sclerosis With MRI
Magnetic resonance imaging, or MRI, has revolutionized the diagnosis of multiple sclerosis. WebMD explains how MRI works in detecting MS abnormalities and tracking the progress of the disease.
Thoracic MRI of the Spine: How & Why It's Done
A spine MRI makes a very detailed picture of your spine to help your doctor diagnose back and neck pain, tingling hands and feet, and other conditions.
Imaging the Heart: The New Frontier
New advances in MRIs, CT scans and echocardiography reveal the mysteries of the malfunctioning heart.
Christina Applegate Seeks Early Detection for Breast Cancer
Inspired by her own battle with cancer, the actress fights to help young women at high risk for the disease.
Diagnostic Imaging: Beam Me Up Dr. McCoy
We're not quite at the Star Trek level yet with imaging technology, but recent advances are fine-tuning your medical care.