| 摘要 |
An apparatus for providing a dental radiological image on the monitor of a display system is provided by the present invention. Said apparatus comprises: an extraoral X-ray source; an intraoral sensor for the X-rays passing through a radiated tooth, said sensor being coaxial to the X-ray beam emerging from said tooth; and an extraoral electronic data processing unit connected to said sensor, said sensor comprising a charge-coupled device and a screen, said screen being located between the charge-coupled device and the radiated tooth, and being provided on entry with a scintillator which converts the X-rays which have passed through the tooth into visible radiation, said screen being made of a layer of translucid material permeable to visible radiation, said translucid material being loaded with particles intended for preventing the passage of X-rays passing through said scintillator and which have not been converted into visible radiation by the scintillator, the diameter of each elemental part opposite the various constituents of the optical system organized according to the transmission of the dental image, i.e. scintillator, screen, charge-coupled device, being progressively increased for an optimization of the capacity of resolution of pixels (picture elements) in the charge-coupled device, and of the reduction of the moiré effect; said screen comprising reducing optical fibers loaded with metallic oxide particles intended to absorb the X-ray energy which has not been converted by the scintillator; and said intraoral sensor comprising a microelectronic means for monitoring the charge-coupled device and for amplifying the output signal of the charge-coupled device.
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