The purpose of enhanced CT is to show more imaging features of the lesion and to make more effective diagnosis and differential diagnosis of certain diseases. Enhanced CT is primarily an intravenous injection of contrast agent, usually using a non-ionic iodine agent, which is used to perfuse the lesion with blood to obtain more image features of the lesion for pathological analysis and diagnosis of the lesion. Enhanced CT often performs a multi-phase scan, capable of performing multiple scans at different time periods, which can further clarify the nature of some lesions that cannot be seen with ordinary CT, especially for some malignant tumors, which can be more clearly diagnosed pathologically. Although enhanced CT has many benefits for disease diagnosis, it can also bring some side effects, such as allergic reactions caused by contrast agents (severe allergic reactions can even be fatal); in addition, contrast nephropathy is also a problem that should not be ignored. Of course, the indications and contraindications for the use of contrast agents should be strictly mastered before the enhancement scan, and the patient’s reaction should be closely observed and actively treated symptomatically during the enhancement process. Overall, enhanced CT scans are very safe.