A CT scan (computed tomography) of the chest uses x-rays to scan the chest from many angles. The detected information is analyzed by the computer. The computer generates an image of the area of the chest being scanned and displays the image on a computer video monitor. The images can also be reproduced as photographs. You will lie flat on a table that is guided into the CT scanner. The scanner emits x-rays from a complete circle around you. This non-invasive procedure is used to examine the structures inside the chest. Common indications for thoracic CT include chest injury, a suspected tumor, fibrosis or to search for bleeding or fluid collections in the lungs and adjacent areas.