What is a CT (or CAT) scan?

Cardiac computed tomography (CT scan), also called computerized axial tomographic (CAT) scan, is an X-ray imaging technique that uses a computer to produce cross-sectional ( tomographic) images of the chest (including the heart and great vessels) or the brain. It’s used to diagnose and evaluate heart diseases such as aortic diseases, cardiac masses and pericardial disease and to define the areas in the brain affected by stroke.

A computed tomography (CT) scan uses X-rays to make detailed pictures of structures inside of the body.

During the test, you will lie on a table that is attached to the CT scanner, which is a large doughnut-shaped machine. The CT scanner sends X-rays through the body area being studied. Each rotation of the scanner provides a picture of a thin slice of the organ or area. All of the pictures are saved as a group on a computer. They also can be printed.

In some cases, a dye called contrast material may be used. It may be put in a vein ( IV ) in your arm, or it may be placed into other parts of your body (such as the rectum or a joint) to see those areas better. For some types of CT scans you drink the dye. The dye makes structures and organs easier to see on the CT pictures.

A CT scan can be used to study all parts of your body, such as the chest, belly, pelvis or an arm or leg. It can take pictures of body organs, such as the liver, pancreas, intestines, kidneys, bladder, adrenal glands, lungs and heart. It also can study blood vessels, bones and the spinal cord.

Fluoroscopy CT is a special test that is not widely available. It uses a steady beam of X-rays to look at movement within the body. It allows the doctor to see your organs move or to guide a biopsy needle or other instrument into the right place inside your body.