The cost of renal enhancement CT is usually around 640 dollars, and the price is not exactly the same in different hospitals. Generally renal enhancement CT should exclude whether the kidney has renal function abnormality, and whether there is any recent application of drugs such as metformin, if these drugs are applied, it is recommended to stop using them for at least 48 hours, and renal function abnormality is also a contraindication to enhancement CT. After doing enhanced CT, it is generally recommended to drink more water and urinate diligently for 24 hours to achieve the purpose of hydration and excretion of contrast agent. Renal enhancement CT can be used to detect renal diseases, such as renal cysts and renal occupancy. In the clinic, we must grasp the indications and contraindications before carrying out the examination, such as checking the renal occupation after the feasibility of PET-CT to rule out the presence of systemic metastasis.