A variant of radiographic imaging is digital x ray. It makes use of digital image capture devices and x-ray sensors, instead of conventional x-ray film and photographic film respectively. Currently, about 20% of dental practitioners use it in their practices. Digital x ray
The two types of image capture devices are the flat panel detection devices and the high density line scan solid state detectors. Flat panel types are further classified as direct or indirect depending on whether they are made up of amorphous-selenium or amorphous-silicon respectively. The high-density line-scan solid state detectors are made up barium fluorobromide laced with caesium bromide phosphor or europium, this material has photo-stimulatory properties.
The x-ray energy is absorbed by the electronic sensors. The serial arrangement of amorphous silicon flat panel detectors and a scintillator made of caesium bromide, form light energy from the x-ray energy. This light energy is discharged through the amorphous silicon photodiode layer where it is transformed into a data output signal that is displayed on thin film transistors or fiber-coupled, charge-coupled devices.
The amorphous-selenium detector transduces the x-ray photon to a charge pattern. This charge pattern is then presented on the thin film transistors array or micro-plasma line addressing. Laser diodes scrutinize x-ray photons that come into contact with phosphor electron detectors, before it sets free stored energy to a mode that can be presented on a charge-coupled device.
In dentistry, it is utilized for extraoral and intraoral imaging. Cephalometric analysis and orthopantomogram are the types of extraoral imaging. A computer can store the resulting images. These images can be zoomed or enhanced and can even be shared digitally.
There are various advantages of this form of radiography. It consumes less time and it also emits less radiation compared to traditional radiography. Enhancement or transfer of the radiographic images can be done. Its processing fee is more economical than traditional radiography, since the chemical processing fee is excluded. Its key demerit is its expensive purchasing cost. Thus, digital x ray potential seems bright.
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