Time-of-flight” technology is an epoch-making technological advancement in the field of PET/CT scanning technology, which not only can significantly improve many technical parameters of PET/CT, but also can further improve the safety and accuracy of patient examinations, and is considered to be the main trend of future PET/CT technology development. The main advantages of PET/CT are: 1. It further improves the image quality and greatly increases the ability to detect microscopic lesions and confirm the diagnosis. Specifically, this test can help patients to rank early tumor lesions as well as accurately diagnose tiny tumor metastases, which can detect tumor lesions as small as 2 mm, improving the accuracy of early diagnosis of tumor diseases. Therefore, the World Health Organization has proposed the goal of tumor control, which is that 1/3 of tumors can be prevented, 1/3 of tumors can be cured, and 1/3 of tumors can prolong life and improve the quality of life. If this goal is achieved, the occurrence of tumor can be reduced by 1/3 and death can be reduced by 2/3. The time-of-flight technology PET/CT makes the early detection of tumor possible, so that early treatment can be achieved, which reduces the cost of treatment and the health hazard of tumor to human beings. 2. PET/CT with “time-of-flight” is the safest PET/CT for patients because of its faster examination time, which can be completed within 10 minutes, and the dosage of radiopharmaceuticals is significantly reduced, minimizing the radiation dose. At the same time, its patented open frame design eliminates the fear and anxiety that patients used to feel during examinations in small, confined spaces, and improves patient comfort. 3. The ultra-high sensitivity of PET/CT with “time-of-flight” technology makes it possible to detect micro-functional metabolic changes in the human nervous system, which greatly improves the clarity and specificity of lesions and facilitates diagnosis and accurate localization. For example, “time-of-flight” PET/CT can be used for the preoperative localization of epilepsy, and 93% of patients can have their disease controlled after surgery; it can also be used for the diagnosis of progeria, the evaluation of mental illness, and the determination of the efficacy of drug treatment.