The exposure required for Computed Radiography (CR) is similar to that of medium-speed film-screen systems, with CR designed to match conventional radiographic exposure levels to facilitate the transition to digital imaging.
The amount of exposure required for Computed Radiography (CR) is most comparable to the exposure needed for a medium-speed film-screen system in radiographic imaging. CR uses photostimulable phosphor plates (PSP) to capture image data, which are then read by a laser scanner and converted into a digital image.
It is designed to have similar exposure levels to conventional radiography to ease the transition from film-based systems to digital systems. Medium-speed films in contrast to high-speed films, require less radiation exposure for image formation while still providing adequate image quality.
Unlike Direct Radiography (DR), which provides immediate images and often requires less exposure than CR, medium-speed film requires similar amounts of radiation to CR for adequate imaging.
In conclusion, CR systems require an exposure level comparable to medium-speed film-screen systems, neither requiring as much exposure as high-speed films nor as little as direct radiography systems.