1. In the 1930s and 1960s, due to historical limitations, personnel engaged in technical work in the early years served as assistants to doctors, mainly relying on simple technical operations such as X-ray photography and X-ray photo processing. Due to the level of foreign language proficiency and knowledge structure, most technical personnel still lack the ability to independently conduct scientific research and summarize experience into written documents. Therefore, except for Shezhiguang's summary of practical experience in 1936 and his advocacy of using the "Xie's position" to project posterior dislocation of the medullary joint, which has been used internationally to this day, there have been few achievements in other fields. The installation and maintenance of equipment rely on foreign engineers.

2. From the 1970s to the 1980s, in addition to continuing to explore the improvement of photography methods and other operational techniques, radiological diagnostic technicians began to apply the achievements of information theory, communication engineering technology, and related disciplines to quantitatively evaluate image quality and analyze the imaging process, thereby greatly improving image quality. At the Third National Radiological Academic Conference held in Zhengzhou in 1981, Yan Shulin and others from Beijing, Cao Houde and others from Shanghai, and Yuan Xingde and others from Shandong presented papers on the evaluation of image quality using the concept and testing methods of modulation transfer function (MTE), filling the gap in China's important topic of objective evaluation of X-ray imaging principles and object quality. In June 1983, the Radiological Society of the Chinese Medical Association held its first national academic conference on technical topics in Tianjin. Nearly 400 radiation technicians attended the conference and presented papers. The content of the paper includes not only X-ray photography, physical mechanics, but also automated processing technology, new imaging equipment, digital imaging technology, and new technologies such as CT and MRI. The Hong Kong Radiological Society was also invited to attend the conference. In September of the same year, Fan Zhong, the disciplinary leader of radiation technology in China, was invited to Yokohama, Japan to participate in the Fourth International Conference on Radiology Technology in the Yawo Region (SIRRT). At the meeting, Fan Zhong introduced the development status of radiation technology in China to the attending representatives. This is the first time that an author in radiation technology in China has participated in an international academic activity. Subsequently, Cao Houde, Chen Hesheng, Qin Weichang, Zeng Xiangjie, Yang Lianyu, and others attended international conferences and presented their papers at the conference. At the same time, foreign radiation technicians such as Professor Chichiu Yamamoto of Nagoya University in Japan have also come to China multiple times for academic exchanges. Due to the introduction of a large batch of 1000 milliampere and highly automated X-ray equipment in the 1970s, such as cardiovascular imaging machines and pulse X-ray cinematography, there has also been significant development in the production and manufacturing of X-ray equipment in China. In this situation, a portion of radiation technicians have turned to work in radiation engineering technology. Due to the widespread lack of educational background and knowledge structure among most personnel at that time, most of them were limited to general maintenance and repair, and few were able to independently install and debug large equipment. The successful convening of the national academic conference signifies that the radiation technology academic community in China has the ability to independently conduct academic activities. The multiple visits of Chinese scholars and the reception of foreign scholars indicate that international exchanges in the field of radiation technology have also begun. At this stage, radiation technology has transitioned from an "experiential" to a "scientific" approach.

3. Since the 1990s, a large number of medical imaging equipment have been put into clinical use, which has led to the development of radiation technology in China from traditional radiology to medical imaging. Therefore, there have been significant changes in both the job content and the team structure of technical personnel. The basic skills of radiation technicians have expanded from X-ray photography to the application of computer technology, as well as the operation and maintenance of large-scale high-tech imaging equipment; The participation in technical operations in interventional radiology has also led to significant changes in the composition of the technical personnel team. The proportion of individuals with high educational qualifications and those who have received further education, training, or formal professional education from abroad is constantly increasing. In 1991, the Society of Radiology of the Chinese Medical Association and the editorial department of the Chinese Journal of Radiology collaborated multiple times to successfully hold a national symposium and learning class on radiation technology quality assurance (QA) and quality control (QC), promoting the establishment of national collaborative networks and enabling QA and QC work to be widely carried out nationwide. In the process of promotion, Fan Zhong, Tao Shuwei, Yan Shulin, Wu Boqing, Zhao Yurasi, Xue Aihua, and others have done a lot of effective work. This work not only brings China's radiation technology management work closer to advanced countries, but also plays a significant role in promoting the transformation of China's technical personnel team to a scientific type. In 1993, the Imaging Technology Association of the Chinese Medical Association was announced to be established. At this point, Chinese radiation diagnostic technicians have effectively carried out academic activities and work under the organization of the association.

4. Since the 20th century, with the continuous and rapid development of computer technology, medical imaging has become one of the fastest developing disciplines in clinical medicine and even basic medicine, and has occupied an increasingly important clinical position in daily diagnosis and treatment work. The imaging quality of imaging related equipment such as X-ray, computed tomography (CT), magnetic resonance imaging (MRI), ultrasound, and nuclear medicine has been significantly improved, from analog mode imaging to digital mode imaging, from two-dimensional imaging to three-dimensional imaging, from structural imaging to functional imaging, and even the development of molecular imaging, Medical radiology has long deviated from the concept of X-ray imaging in the Roentgen era more than 100 years ago, and has elevated it to a new level of combining morphology and function imaging, diagnosis and treatment. It also provides an important and broad technical platform for the development of other clinical disciplines, and effectively promotes the development of clinical medicine.