Considering the detection and characterization of lesions, there is not much difference between CT or ultrasound examinations. The difference between them both is considered from other aspects. First, ultrasound examination requires higher experience of the examining physician, because the leakage rate of experienced physicians is generally much lower than that of young physicians who have just come out, and the subjectivity of ultrasound examination is stronger. CT examination is a continuous level scan, which can ensure a complete examination of the kidney and will not be greatly influenced by the subjectivity of the examining physician, and the film of CT scan will not be missed because of inexperience, as long as it is in the consultation Second, clinicians prefer to read CT films for clinical diagnosis and treatment decisions, on which they can see the kidney vascular situation and the lymph node situation. These lesions are not visually displayed in the ultrasound report; third, CT examinations have radiation, while ultrasound is radiation-free. Therefore, in terms of radiation protection, we often use ultrasound for kidney examination instead of CT examination.