What does dr exposure mean?

DR system, that is, direct digital X-ray photography system, consists of electronic cassette, scanning controller, system controller, image monitor and so on. It directly converts X-ray photons into digital images through electronic cassette, which is a generalized direct digital X-ray photography. Direct digital photography in a narrow sense is DDR(DirectDigit Radiography).

Generally speaking, it refers to the digital radiography which adopts the image direct conversion technology of flat panel detector, and it is a real direct digital X-ray photography system. According to the types of detectors, they are mainly divided into amorphous silicon flat plate DR (mainstream), amorphous selenium flat plate DR and CCD DR (mainstream). According to the frame structure, it is divided into suspended DR and upright DR (UC arm).

X-ray image information is converted into digital image information, and its exposure latitude has some advantages over ordinary intensifying screen-film system: CR and DR have a wide dynamic range and a large exposure latitude due to the adoption of digital technology, which allows technical errors in photography and can obtain good images even in some parts where exposure conditions are difficult to grasp.

CR and DR can perform various image post-processing according to clinical needs, such as various image filtering, window width and window level adjustment, zoom roaming, image mosaic and distance, area and density measurement, etc., which provide technical support for detailed observation, before and after comparison and quantitative analysis in image diagnosis.