Enhanced CT is one of the adjuncts to tumor screening, and enhanced CT has a stronger visualization of the mass than plain CT. The main difference between enhanced CT and ordinary CT is that the contrast agent, also called contrast agent, is injected when enhanced CT is performed. And the contrast agent is obviously highlighted on CT, through the contrast agent in the blood vessels of the mass and the peripheral blood vessels at different times, thus showing the hemodynamic characteristics of the tissue, thus helping to identify whether a mass is a tumor tissue or not. For example, enhanced CT is one of the commonly used tools in the diagnosis of hepatocellular carcinoma. By utilizing the obvious enhancement of the contrast agent in the arterial phase and the decrease in density in the portal and delayed phases, which is a fast-in, fast-out performance, a basic diagnosis of a mass as hepatocellular carcinoma can be made. Generally speaking, CT enhancement scanning is routinely applied to CT examination of tumor patients in the absence of contraindications. However, it should be noted that the diagnosis of tumor must be clarified by biopsy to determine the nature of the mass even if the typical imaging manifestations are present.