Imaging apparatus

Details Imaging apparatus Imaging apparatus

1996-07-12

1997-12-02

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 987, H04N 315, A61B 614

Patent

active

056944489

ABSTRACT:
In imaging apparatus particularly for use in intra-oral dental applications, a solid state imager is continually clocked out during a wait period prior to irradiation from an X-ray source. A signal derived from the CCD is compared with a threshold at to determine the onset of irradiation by the X-ray source which will appear as a rapid change in the signal level. The threshold conditions are varied to follow changes in ambient conditions and particularly temperature changes to allow for increase of dark current with a rise in temperature. This permits the threshold at which the CCD is triggered to begin image acquisition to be set at a relatively low level whilst minimising the risk of false triggering.

REFERENCES:
patent: 4437743 (1984-03-01), Sakai et al.
patent: 5053873 (1991-10-01), Taniji
patent: 5513252 (1996-04-01), Blaschka et al.

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