When it comes to nuclear, everyone has some palpitations. Will the use of nuclear technology for physical examinations have some kind of effect on the body? The amount of radiation that a patient receives during a nuclear medicine examination is much less than that of radiology CT. Its most important feature is its ability to provide functional changes in the tissues of the body, which often occur early in the course of disease. The more familiar ultrasound, CT and magnetic resonance imaging (MRI) examinations can provide information on anatomical changes in the human body. Compared with them, nuclear medicine can, in some cases, detect diseases earlier and determine the nature and development of diseases. Nuclear medicine SPECT can understand the function of the heart, kidney, liver, gallbladder, thyroid and other major organs; it can understand the blood flow condition of the heart muscle, brain, lung and other organs; it can understand and Determine the presence of tumors and lymphatic metastases and bone metastases, and all related organs and tissues function, blood flow and metabolism.