The Basics A CT Scan (computerized tomography) or CAT (computed axial tomography) is a noninvasive, painless procedure that uses X-Rays in combination with computer technology to produce high-resolution images of the inside of the body. The images produced display the body’s bones, blood vessels and soft tissue organs, in much greater detail than standard X-Rays. This allows doctors to visually, assess the severity of an injury or illness. CT Scanners use an X-Ray technique that creates cross-sectional images, often called slices (think of a sliced loaf of bread). All of our Family Emergency Room locations have state-of-the-art, 64-slice CT scanners.