To use all functions of this page, please activate cookies in your browser.
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
Additional recommended knowledge
The radiological examinations in dentistry may be classified in: intraoral - where the film or the sensor is placed in the mouth, the purpose being to visualize a limited region and extraoral where the film or the sensor is outside the mouth and the purpose is to visualize a wide region. In dentistry, extraoral imaging splits in: Panoramic X-ray (aka "panorex" or "pano") showing a section, curved following more or less mandible shape, of the whole maxillo-facial block and the Cephalometric X-ray showing a projection, as parallel as possible, of the whole skull.
Digital radiographic systems
One particular type of digital system uses a Memory Phosphor Plate (aka PSP - Phosphor Plate) in place of the film. After X-ray exposure the plate (sheet) is placed in a special scanner where the latent formed image is retrieved point by point and digitized, using a laser light scanning. The digitized images are stored and displayed on the computer screen. This method is half way between old film based technology and the current direct digital imaging technology. It is similar to the film process because it involves the same image support handling and differs because the chemical development process is replaced by the scanning process. This is not much faster that film processing and the resolution and sensitivity performances are contested. However it has the clear advantage to be able to fit with any pre-existing equipment without any modification because it replaces just the existing film.
Also some times the term "Digital X-rays" is used to designate the scanned film documents which further are handled by computers.
The other types of digital imaging technologies use electronic sensors. A majority of them first convert the X-rays in light (using a GdO2S or CsI layer) which is further captured using a CCD or a CMOS image sensor. Few of them use a hybrid arrangement which first convert the X-ray into electricity (using a CdTe layer) and then this electricity is captured as an image by a reading section based on CMOS technology.
Historical milestones for Digital Intraoral Sensors
1987 - RVG, the world wide first intraoral X-rays imaging sensor available on the market, introduced by Trophy Radiology (France) was very quickly and largely recognized by the European dental market. This company is owned actually by Kodak and continues to produce intraoral sensors.
The manufacturers claim the resolution is between 12 to 25 LP/mm. A useful precise comparison is difficult because depends on many parameters including the post processing or imaging software.
Currently there are several digital systems for panoramic digital radiology. Some of them are rebranded. Examples: SCAN300FP of Ajat was or is sold as SuniPan or RetroPan or Panoramic Corporation pan, DXIS of Signet was or is sold also as of LightYear, Sigma Biomedics, Panoramic Corporation, AFP Digital or Bluex, iPan of Schick was or is sold as of Bluex or Panoramic Corporation, I-MAX of Owandy sold as of Villa, etc.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Digital_radiography". A list of authors is available in Wikipedia.|