This CT section of a gunshot wound shows bone and bullet fragments in the wound track.There is outward beveling at the exit wound of the skull, 2003. A CAT scan is a three-dimensional image of a cross section of the body made with x-rays that is useful in diagnosing disease (for example, in detecting tumors). CAT stands for c omputerized a xial t omography, the name of the method used to produce the image.