PET/CT is the accurate radar for tumor diagnosis PET-CT is currently the best tool for diagnosing and treating three life-threatening diseases, namely tumor, coronary heart disease and neuropsychiatric disease, especially for greatly improving the accuracy of early tumor diagnosis, PET-CT can make tumor lesions invisible and advance the detection time of most tumors by more than one year. PET-CT, known as Positron Emission Computed Tomography (PET), is a newest achievement in the field of nuclear medicine that combines the functional information obtained by “Positron Emission Computed Tomography – PET” with the anatomical information obtained by “X-ray Computed Tomography – CT”. “The PET-CT is a new technology in the field of nuclear medicine that fuses the functional information obtained by PET with the anatomical information obtained by CT. Since PET-CT provides molecular information on the exhaustive functions and metabolism of human cells, it can sensitively and accurately reflect the appearance of tumors. PET-CT has the irreplaceable advantages of other imaging devices in health checkup, early diagnosis of tumor lesions, differential diagnosis of benign and malignant tumors, search for primary foci and metastatic cancer, evaluation of tumor efficacy, identification of tumor recurrence and necrosis, and localization of biological targets for radiotherapy, diagnosis of neuropsychiatric diseases and cardiovascular diseases, and represents the highest level of international medical imaging development nowadays. PET-CT can diagnose tumor 1-2 years in advance Because PET-CT can obtain tomographic images of all directions of the body to understand the overall condition of the body in one image, and achieve the purpose of early detection of lesions and diagnosis of diseases, it is known as the “high precision radar” for tracking tumor diseases, and has been rated as the most valuable medical technology of the 21st century by Time Magazine. PET-CT technology is to inject extremely small amount of positron tracer into human body, and then use special in vitro detection instrument (PET) to detect the distribution of these positronuclides in human body organs, and then combine with the precise positioning of CT to accurately show the physiological metabolism and anatomical structure of human organs. PET-CT is the most perfect and highest grade medical imaging equipment available today, and it is the only reliable examination equipment for the early detection of tumors. While traditional imaging examinations such as CT and MRI detect diseases from anatomical changes, PET-CT detects diseases from functional metabolic changes before anatomical changes occur. PET-CT is a comprehensive way to achieve the goal of “four definitions” in medical imaging: “localization”, to detect lesions and identify lesion sites; “characterization”, to clearly show the pathology and pathophysiology of morphological and functional changes; “quantification”, to clearly show the pathology and physiological nature of morphological and functional changes; and “quantification”. Quantitative”, to quantify the morphological and functional changes of a disease or lesion; and “Periodic”, to determine the stage of disease progression. Thus, PET-CT detects tumors 1-2 years earlier than traditional medical examination methods. Early treatment and control of the tumor can change the treatment plan and make the tumor no longer an “incurable disease”. PET-CT has unique advantages in diagnosing and evaluating the efficacy of tumors, heart and brain diseases, and is often used for early differential diagnosis, grading and staging of tumors, as well as for treatment evaluation and precise localization, The diagnostic accuracy for lung cancer, melanoma, esophageal cancer, colon cancer, head and neck cancer, lymphoma, breast cancer, pancreatic cancer and ovarian cancer is more than 90%. Since the incidence of tumors in the family is significantly higher than that of the general population, it is particularly important for them to have PET-CT for early detection of tumors. Mainly applicable groups: High-risk groups with family history of tumor; people with long-term bad habits (such as smoking and alcoholism); people who are in special working environment with serious pollution and exposure to carcinogenic substances for a long time; high-pressure people over 40 years old with long-term subhealth condition; people with increased tumor markers, abnormal oncogene, abnormal lesions or cancer cells in the body found by physical examination; people who have felt lumps in the body or other imaging Those who have been diagnosed with tumor and need correct staging, identification of cancer recurrence, metastasis and prognosis, and treatment plan, etc.