PET is one of the more sensitive tests in tumor diagnosis and determines the benign or malignant nature of a mass by the SUV value, which is known as the standardized uptake value (SUV), and is also used in lymphomas. In general, a normal SUV value of less than 2.0 and more than 2.5 indicates a high likelihood of malignancy, while a benign likelihood of malignancy is high between 2.0 and 2.5. SUV is a semi-quantitative indicator of local tissue uptake of contrast agent activity versus systemic average injected activity.SUV=radioactivity concentration of the lesion/injected dose/body weight. The SUV values of different tumors have different degrees of uptake, and for determining whether a tumor is malignant or not, it depends on which specific tumor condition. PET is only one of the more sensitive tests in tumor diagnosis, and a final diagnosis requires a pathology test.