DR, also known as digital x-ray machine, direct digital x-ray camera system, digital x-ray machine. Digital X-ray machine is a combination of computer digital image processing technology and X-ray radiation technology and the formation of an advanced X-ray photography technology, it is based on the original diagnostic X-ray machine direct film imaging, through A/D conversion and D / A conversion, real-time image digital processing, and thus the image to achieve digital. DR direct digital radiography system has the advantages of clear image quality, fast imaging speed, and less radiation than traditional X-ray machines.