DR is based on the X-ray television system, the use of computer digital processing, so that the analog video signal after sampling, analog/digital conversion (analog to
digit, A/D) directly into the computer for storage, analysis and preservation. x-ray digital image of high spatial resolution, dynamic range, the image can be observed with a contrast ratio of less than 1%, a diameter of more than 2MM
digit. With high spatial resolution and large dynamic range, the images can observe objects with a contrast ratio of less than 1% and a diameter of more than 2MM
, and the measured surface X-ray dose to the patient is only 1/10th of that of conventional radiography. the quantum
efficicncy (DQE) can be more than 60%. the X-ray information is digitized and can be processed by a computer. By improving image detail, reducing image noise, grayscale, contrast adjustment, image magnification,
digital subtraction, etc., it reveals characteristic information that is not visible in unprocessed images. With the help of artificial intelligence and other technologies for quantitative analysis of images and feature extraction, computer-aided diagnosis can be performed. Digital radiography includes selenium
drum mode, direct digital radiography (direct digital radiography; DDR), charge coupled device (charge coupled
device; CCD) camera array mode and other modes. The digital image has a high resolution, good image sharpness, details show clearly; radiation dose is small, exposure tolerance, and according to the clinical needs of
All kinds of image post-processing, etc., but also to achieve the radiology department without film, between departments, hospitals, networked, and easy to teach and consultation.