Home > Encyclopedia of Neurological Disorders > Magnetic Resonance Imaging (MRI)

Definition

Magnetic resonance imaging (MRI) scanners rely on the principles of atomic nuclear-spin resonance. Using strong magnetic fields and radio waves, MRI collects and correlates deflections caused by atoms into images. MRIs (magnetic resonance imaging tests) offer relatively sharp pictures and allow physicians to see internal bodily structures with great detail. Using MRI technology, physicians are increasingly able to make diagnosis of serious pathology (e.g., tumors) earlier, and earlier diagnosis often translates to a more favorable outcome for the patient.

Description

A varying (gradient) magnetic field exists in tissues in the body that can be used to produce an image of the tissue. The development of MRI was one of several powerful diagnostic imaging techniques that revolutionized medicine by allowing physicians to explore bodily structures and functions with a minimum of invasion to the patient.