Automatic exposure control for dental panoramic and cephalographic x-ray equipment
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United States of America Patent
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Apr 22, 2003
Grant Date -
Jul 4, 2002
app pub date -
Dec 19, 2001
filing date -
Oct 8, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus and method used in dental panoramic and cephalographic x-ray equipment provides automatic adjustment of the pre-programmed exposure factors in order to obtain optimisation of the grey scale of the latent image on various kinds of x-ray detectors, such as the radiographic film or x-ray image detector plates. A sensor, such as photo diodes, detects the intensity of the radiation passed through the patient and incident on the x-ray detector and feeds it to a control unit. The control unit provides a computed simulation of the latent image grey level and adjusts the programmed exposure factors in order to establish the grey level of the latent image at the required reference value.
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