When you walk into a hospital, you will know about internal medicine and surgery, and you will also know about laboratory and radiology, but when it comes to nuclear medicine, many people may not have heard of it. Nuclear medicine is a department that uses modern nuclear technology, that is, the use of radionuclides and their labeled drugs to diagnose and treat diseases. When it comes to nuclear technology, people may be afraid, but in fact, nuclear medicine is the peaceful use of nuclear technology, mainly using a small amount of short half-life nuclides, the radiation to the human body is very low, nuclear medicine technology is very safe. The most basic technology of nuclear medicine is radionuclide tracer technology, which provides an effective modern technological means for diagnosis and treatment of diseases, and is also one of the important symbols of modern medicine. Due to the unbalanced development of nuclear medicine in China, nuclear medicine departments are mostly concentrated in large hospitals at provincial and municipal levels, and few small and medium-sized hospitals have nuclear medicine departments. In fact, nuclear medicine department can carry out in vivo imaging diagnosis, in vitro detection and diagnosis as well as nuclide therapy, among which, the application of imaging diagnosis involves all organs of the body, and can be used for the examination of tumor, cardiovascular, neurological, respiratory, digestive, skeletal, endocrine, hematopoietic, genitourinary system and other diseases, diagnose and evaluate diseases from the functional and metabolic level, which has good application value in clinical practice. We believe that as nuclear medicine becomes more popular in the future, you will hear the word “nuclear medicine” more and more often.