Introduction to Magnetic Resonance Imaging (MRI)

Texas Instruments

Published Date: 14 Sep 2017


Magnetic Resonance Imaging is a non-invasive diagnostic technology that produces anatomical images. Unlike computed tomography (CT), MRI does not carry the risk of ionizing radiation exposure. The MRI system shown in this application note uses a superconducting magnet to align hydrogen atoms in the body; then excites the atoms with radio frequency (RF) energy from the transmitting RF coil. As the atoms return to equilibrium, energy is released in the form of radio waves which are recorded by the receiving RF coil. The rate at which the atoms return to equilibrium, as well as the energy released, is determined by the location and chemical makeup of the surrounding material. This information is processed to create images of the tissues present in the body.