CLINICAL MEDICINE

Detailed explanation-1: -Intensifying screens convert the X-rays received into light, which forms the image on the film. This reduces the exposure needed to provide a diagnostic image. The latent image is converted into a permanent visible image through the use of developer and fixer.

Detailed explanation-2: -The combination of screen films, intensifying screens and cassettes are used in making extraoral images. The main function of screens is to reduce radiation to the patient.

Detailed explanation-3: -The extraoral projections used most frequently in dentistry are panoramic and cephalometric views. For these projections, screen film is used with intensifying screens (described later in this chapter) to reduce patient exposure (Fig. 5-9). Screen film is different from dental intraoral film.

Detailed explanation-4: -Intensifying screens intensify the effect of the X-ray beam energy on the film by energy conversion. Some X-ray energy is absorbed by the screen and re-emitted as u. v. and visible light energy (Figure 5.1), to which the film has a greater sensitivity, thus producing a greater film response.