Abstract
High-quality radiographic images and protection of the patient and operator from excess irradiation are requirements for any dental X-ray system. Two proposed techniques fulfill these requirements. A collimating device, designed to produce a rectangular X-ray beam of variable dimension, is used. The size, shape, and location of the X-ray beam is marked first by a projected light beam. This beam can be used to cast a shadow of the teeth on the film packet that is identical to the radiographic image. The X-ray tube is aimed vertically from above the patient who is in a supine position. Radiosensitive regions of the body are outside the path of primary radiation.
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