When the temperature is above absolute zero (-273°C), any object will produce infrared radiation. As a natural infrared energy carrier, human beings need to continuously emit infrared radiation energy to maintain their body temperature constant. Infrared thermal imaging technology is through the instrument to collect the human body surface outward radiation of infrared waves, with the help of computational processing, and finally the human body surface of infrared radiation information into the infrared heat map can be directly observed by the naked eye, and the body surface temperature changes can be quickly displayed and analyzed.
　　A, infrared thermal imaging technology to detect the advantages of the human body
　　Infrared thermal imaging technology can intuitively display the thermal structure of the human body, which has the characteristics of sensitive and accurate, simple and convenient, comprehensive, intuitive imaging, no damage to the human body, not only can be found earlier in the cold and heat deviation state of various parts of the human body, through the combination of various clinical examination, can achieve the purpose of assisting clinicians to identify the disease, track the development of disease changes, guide the clinical treatment and efficacy assessment, and at the same time can be used for Chinese medicine It can also objectify the basic theories of Chinese medicine, such as physical assessment, exploration of energy changes in human meridians and acupuncture points, the influence of the four seasons on the functions of human internal organs, and the influence of qi and blood on human energy. In other words, compared with other inspection equipment as well as technology, infrared thermography can achieve the role of early screening and disease prevention.
　　Second, infrared thermal imaging technology in the medical field of application
　　1、Early prediction
　　According to this principle, the infrared radiation of the human body is collected by the thermal imaging system and converted into digital signals to form a pseudo-color thermogram. Using special analysis software, the thermogram is analyzed by professional physicians to determine the location of human lesions, the nature of the disease and the degree of lesions, which provides a reliable basis for clinical diagnosis and can provide a comprehensive early warning analysis for a variety of diseases throughout the body.
　　Infrared thermography detects diseases according to the abnormalities of human body temperature, so it can interpret the potential hidden diseases without obvious signs in the body, which can win valuable time for early detection and prevention of diseases.
　　2、Healthy experience
　　Infrared thermal imager does not emit radiation when working, it passively receives infrared rays from the human body through the detector, which will not cause any harm or adverse reaction to the human body, and also does not require markers, and will not cause any pollution to the environment, which is non-damaging, non-radioactive, green, low-carbon and low-energy inspection, and is convenient, fast, sensitive and economical for the fast pace of modern life.
　　3、Health special examination
　　Specialized examination for each specialized system disease and functional status. Medical infrared thermography system can make a comprehensive and rapid assessment of the health status of each system in the health checkup and make early screening tips for disease information. It can be used as special medical checkup package items, single screening items, and post-test health management tools.
　　4、Screening of major diseases
　　Early detection of major diseases such as cardiac, cerebrovascular and tumor, as well as screening of sudden epidemics and regional epidemics, based on observation of abnormal performance of the immune system, endocrine system, and local tissues and organs and their corresponding lymphatic regions.
　　To study the physiological and pathological responses of diseases from the perspective of cellular metabolism and changes in body functions, and to provide auxiliary diagnostic methods for clinical research. Use the characteristics of temperature change before disease change for the early detection of disease.
　　5、Human body temperature screening and epidemic prevention and control
　　For fixed personnel in fixed spaces, such as hospitals, detention centers, etc., imaging technology is used to uninterruptedly monitor changes in human body temperature and provide early warning of phenomena such as high fever and loss of temperature (decay of vital signs) to protect the personal safety of the personnel being cared for. By setting up multiple monitoring areas, different people can be monitored individually.
Under normal circumstances, the human body temperature is relatively constant. When the body temperature rises or feverish symptoms appear, it is usually when the human body begins to develop various types of inflammation, illnesses, or even infectious diseases, such as avian influenza, influenza A (H1N1), atypical pneumonia (SARS), etc. The new crown epidemic, common signs are respiratory symptoms, fever, cough, shortness of breath and breathing difficulties, etc. Through infrared temperature measurement system can quickly screen abnormal body temperature or fever groups, and does not require the operator to close contact with the person being measured, so as to effectively limit the spread of infectious viral diseases and play an important role in the war against epidemics.