The contrast agent used for CT-enhanced scanning is a non-ionic contrast agent containing iodine, which is a common type of contrast agent with different contents but similar methods of use, and the different concentrations are only for different diagnostic purposes and requirements. If the purpose is to diagnose a tumor, a lower concentration of the contrast type is usually used. If you want to better display the blood vessels, so that the blood vessels form a clear image, you can use a high concentration of iodine ion-containing contrast medium, the rendering effect will be better. In conclusion, the contrast agents used for enhanced CT are non-ionic contrast agents containing iodine, which are relatively safer and have fewer side effects.