Digital Radiography CATEGORY DESCRIPTION
Digital radiography is a type of x-ray imaging that uses digital x-ray sensors. It is fast replacing traditional photographic film because of key advantages to the dental practice: immediate access to images, ease of storage, and lower costs from bypassing chemical processing. Other significant advantages are increased dose efficiency with possible reduction in radiation exposure to the patient and the ability to transfer images easily and enhance them digitally to improve the display quality. The two major forms of digital image-capture devices are flat-panel detectors and high-density line-scan solid-state detectors.
Flat panel digital x-ray detectors use either a direct or an indirect technique for converting x-rays into an electric charge. In both types of detectors, an electronic readout mechanism senses the electric charge pattern that remains, and analog-to-digital conversion then produces the digital image.
A high-density line-scan solid-state detector contains a photostimulable barium fluorobromide that is doped with europium or caesium bromide phosphor. The phosphor detector records the x-ray energy during exposure and is scanned by a laser diode to stimulate the stored energy, which is then released and read out by a digital image capture array of a charge-coupled device (CCD). CCD-based detectors require optical coupling and image demagnification; however, they are readily available and typically reasonably priced.
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