1.”Cancer prevention physical examination” 2.Scientific and accurate staging of tumors 3.Monitoring of tumor recurrence and metastatic foci, evaluation of the efficacy of radiotherapy and surgical treatment 4.Identification of benign and malignant tumors and judgment of the degree of malignancy 5.Discovery of metastatic foci and searching for the primary foci 6.Determination of the scope of the bio-target area of the tumor radiotherapy 7.Help to clinically determine the site of the puncture of the tumor