Radiography
DR:
Broadly defined, DR includes all digitized radiography, while narrowly defined, DR refers to the direct use of electronic imaging plate technology. An electronic imaging plate consists of a large number of tiny detectors arranged with thin-film transistors (TFTs). Due to the different modes of electron conversion, they are divided into indirect DR plates, which use a cesium iodide scintillation screen to convert X-rays into visible light, which is then received by the detector through photoelectric conversion, and direct DR plates, which use amorphous selenium to directly emit electrons that are received by the detector. Physically, the quantum conversion efficiency of direct DR plates should be higher than that of indirect DR plates. However, at the present time, the stability of indirect DR plates is good. Compared with CR, the image resolution and working efficiency of DR is more and the amount of X-rays is lower. With the improvement of imaging speed, DR is developing from static to dynamic direction, which will make digital fluoroscopy possible. However, DR units are currently expensive, and the original X-ray machine must undergo major remodeling and upgraded connections. This technology can realize automated detection, on-site detection of the results, but like phased array ultrasound, the need for construction vehicles and equipment must arrive at the scene, in the harsh field environment which is often the most difficult to solve the problem, restricting the large number of field applications of DR technology.