Abstract:As a fast and intuitive non-destructive testing technology, element imaging is widely used in many fields such as nuclear industry, aerospace, new energy, geology, archaeology, and advanced manufacturing. Among them, X-rays have strong ability to penetrate objects, and terahertz and millimeter waves have been widely used in the field of security inspection due to their non-contact and low damage to the human body. This article summarizes and summarizes the data sets of these three imaging technologies and image processing technologies in recent years, providing strong technical support for further in-depth applications in this field.