Magnetic Resonance Imaging (MRI) is a medical imaging technique used to create detailed images of the body. MRI provides a more accurate picture of soft tissue, including the brain, than other imaging techniques such as X-rays and CT scans.
The MRI system consists of a large ring-shaped magnet that helps create a magnetic field around the body when activated. This field causes small nuclear magnetic particles in the body’s tissues to align and produce a signal, which is detected by a scanner to form an image.
MRI scans are usually done inside a specialized tube called a bore. The patient lies on a table, and then the table is inserted inside the tube. Inside the tube, a strong magnetic field is created that affects the environment around the patient. The patient may be given a special dye that helps enhance the image clarity. This dye, called contrast dye, is sometimes injected into a vein before the MRI scan.
During the MRI scan, the patient is given loud series of noises that can be uncomfortable and can interfere with concentration. In many cases, headphones or ear protection are provided to reduce the sound level. In order to remain still while the scan is in progress, the patient may receive a sedative or painkiller.
MRI scan results are typically transferred to computer software that creates a two-dimensional or three-dimensional image on which doctors can view the structures of the body. The images can then be diagnosed for signs of diseases, such as tumor formation or swelling in the brain, or to demonstrate the location of a broken bone.
In addition to its use in diagnosing illnesses, MRI is also used to monitor tissue injury throughout treatment, monitor the progress of a disease, and to identify changes in the body related to aging.
MRI is a safe and noninvasive imaging technique that does not use radiation. However, pregnant women should not undergo an MRI, as there is a risk of exposing the fetus to the magnetic field. Additionally, MRI machines are not compatible with some metallic implants such as cardiac pacemakers or arteriovenous shunts, as the magnetic field may cause them to malfunction.
