Tumor is a major killer that endangers our human health. Although we have been trying to overcome the problem, we still have no effective method for most of the middle and late stage tumors, except for the effective treatment of many early stage tumors. Therefore, early detection of tumors is an important way to ensure the health of human beings. What is PET/CT? PET/CT is the most advanced cancer detection equipment nowadays, which organically combines PET and CT equipment together, using the same examination bed and the same image processing workstation.PET/CT has the functions of both PET and CT, but it is never a simple superposition of the two functions, as PET and CT have complementary advantages, 1+1>2. PET can display lesions PET can show the pathophysiological characteristics of the lesion, which makes it easier to find the lesion; CT can precisely locate the lesion and show the structural changes of the lesion. PET/CT not only has the respective functions of PET and CT, but also its unique fusion image, which can reflect the pathophysiological changes and morphological structure of the lesion at the same time by fusing PET image with CT image, and obviously improves the accuracy of diagnosis. PET/CT principle Most tumors in human body are metabolized vigorously, malignant tumors are metabolized more vigorously than benign tumors, and the higher the degree of malignancy the higher the metabolic level. According to this feature, before doing the examination, the person undergoing the examination is injected with a certain amount of metabolic substances – positron tracer, and under PET/CT, using PET tracer detection technology, the doctor can accurately see the distribution of metabolic substances, and if there are more metabolic substances gathered in any place, it means that the metabolism is strong here. Based on the degree of metabolic substance accumulation and CT performance, it is possible to determine whether there is a tumor and the benignity or malignancy of the tumor, etc. With its advantages, PET/CT has gradually become popular in clinical application and has become an important item in high-end medical examination, and is also the best choice for tumor patients to determine the stage of tumor. However, the price is still high, so those who are in a position to do so can choose it.