Magnetic Resonance Imaging (MRI) is a non-invasive medical imaging technique that uses a magnetic field and computer-generated radio waves to create detailed images of the organs and tissues in the body. MRI machines are large, tube-shaped magnets that produce high-resolution images of the inside of the body that help diagnose a variety of conditions. The MRI machine works by passing an electric current through coiled wires to create a temporary magnetic field in the body. A transmitter/receiver in the machine then sends and receives radio waves. The computer then uses these signals to make digital images of the scanned area of the body.

MRI is a painless and safe procedure that produces very clear images of the organs and structures inside the body without using X-rays (radiation) . It is the most frequently used imaging test of the brain and spinal cord and is often performed to help diagnose a variety of conditions. MRI can be used to examine almost any part of the body, including the brain and spinal cord, bones and joints, breasts, heart and blood vessels, and internal organs such as the liver, womb, or prostate gland. A special type of MRI is the functional MRI of the brain, also known as fMRI, which produces images of blood flow to certain areas of the brain. Functional MRI can be used to examine the brains anatomy and show which parts of the brain are handling critical functions, language, and movements. This information can help guide decisions when considering someone for brain surgery. Functional MRI also can check for damage from a head injury or from conditions such as Alzheimers disease.

MRI is a very useful and generally safe imaging test that healthcare providers use for a variety of reasons. If you need an MRI scan and are worried about the procedure, you can talk to your healthcare provider to learn more about what to expect and how to prepare.