A patient undergoing an MRI
Many people confuse MRI (magnetic resonance imaging) with CT or CAT Scans (Computed Axial Tomography). These imaging exams are quite different.
CAT Scan - Definition
A CAT scan is a specialized kind of x-ray. In this type of procedure, the patient lies down and is slid into a large, circular opening. The tube into which the patient is wheeled rolls around the patient to collect images that are processed by a computer.
MRI - Definition
An MRI machine uses radar waves and magnets in order to create images for diagnosis. Unlike the CAT scan, no X-rays are used. Similar to a CAT scan, the patient is placed in a long cylinder, which is a large magnet, where he is told to remain still. The machine collects and produces the required images after about a half-hour.
CAT Scan - Production of Images
Iodine-based contrast agents are sometimes used in a CAT scan. The substances are absorbed by abnormal tissues, therefore making it easier to see any tumors in the resulting images.
MRI - Production of Images
In an MRI, images are produced when a computer sends a radio wave throughout the patient's body and obtains a signal that's emitted through hydrogen atoms in the body's cells. The details are collected by an antenna and transferred to the computer. The images, although similar to CAT scan images, contain much more detail with respect to the soft tissues in the body.
Useful CAT Scan Tests
CAT scans are better used for images of the bones, and are good for examining the skull, sinuses, chest, abdomen and pelvis.
MRI Tests
MRIs are useful in producing images of the soft tissues of the body. They can produce images of tumors in the brain; sensory and neural parts of the body; the cranial nerve; joints, including the fingers and toes; and any area where tumors in the soft tissues may exist.
Tags: soft tissues, Production Images, soft tissues body, tissues body
