The cost of kidney enhancement CT is usually around$640, and the price is not exactly the same in different hospitals. Generally kidney enhancement CT should exclude whether the kidney has abnormal kidney function, and whether there are recent applications of metformin and other drugs, such as the application of these drugs, it is recommended to stop using them for at least 48 hours, abnormal kidney function is also a contraindication to enhancement CT. It is generally recommended to drink more water and urinate more often within 24 hours after doing the enhanced CT to achieve the purpose of hydration and excretion of contrast agent. Renal enhancement CT can be used to detect kidney diseases, such as renal cysts and renal occupancy. In clinical practice, it is important to grasp the indications and contraindications before examination, such as PET-CT is feasible after examination of renal occupancy to exclude the presence of systemic metastasis.