Lumbar MRI scan
Alternate Names : Magnetic resonance imaging - lumbar spine, MRI - lower back
Definition
A lumbar magnetic resonance imaging (MRI) scan is a noninvasive way to create detailed pictures of the part of the spine that runs through the lower back. This area is called the lumbar spine. It consists of five vertebrae called L1 to L5. Unlike x-rays and computed tomographic (CT) scans, which use radiation, MRI uses powerful magnets and radio waves. The MRI scanner contains the magnet. The magnetic field produced by an MRI is about 10 thousand times greater than the earth's. The magnetic field forces hydrogen atoms in the body to line up in a certain way (similar to how the needle on a compass moves when you hold it near a magnet). When radio waves are sent toward the lined-up hydrogen atoms, they bounce back, and a computer records the signal. Different types of tissues send back different signals. Single MRI images are called slices. The images can be stored on a computer or printed on film. One exam produces dozens or sometimes hundreds of images. See also:
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