Enhanced CT is a means of examination based on CT plain scanning, which is performed at different times after intravenous injection of contrast agent. The purpose of enhanced CT is to strengthen the contrast between the lesion and the surrounding tissues, which is more conducive to the discovery of the lesion, and can clearly show the scope and nature of the lesion, which is conducive to making a diagnosis of the disease, and reduce the leakage of diagnosis and misdiagnosis. Enhanced CT and ordinary CT examination process is almost the same, the main difference is that before doing enhanced CT, first through the intravenous injection of contrast medium, after a certain period of time, when the contrast medium through the vascular system to reach the examination site, and then carry out a number of scans, in order to find the lesions. When doing the enhanced ct, it is important to note that you must have an empty stomach to avoid the reaction of vomiting after injecting the contrast agent, and also to avoid having food left in the body, which can affect the results of the examination. Some patients may experience allergic reactions such as itching, nausea and vomiting after the enhanced ct examination.