The main difference between enhanced CT and normal CT is the following: 1. The principle is different, the former is a method of imaging by intravenous injection of contrast agent on the basis of normal CT. 2. The information content displayed by the two examinations is different. Enhanced CT makes use of the different blood supply between the diseased and normal tissues, and the different degree of enhancement after contrast injection, so that in addition to the content displayed by ordinary CT, it can also outline the outline of the lesion more clearly, as well as the characteristics of the internal blood supply, and determine the nature of the lesion more accurately than ordinary CT. 3, Radiation is different. When the same type of instrument is used for examination, the accumulated radiation of enhanced CT is higher than that of ordinary CT examination. Because enhanced CT requires three scans, while ordinary CT this scan once.