This right anterior view of a three-dimensional CT reconstruction of the bony skull with bullet wounds shows the hole of the exit wound through the right-sided temporal entrance wound, 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.