Imaging apparatus

Details Imaging apparatus Imaging apparatus

1996-07-19

1999-04-13

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

G01T 124

Patent

active

058941290

ABSTRACT:
In an imaging apparatus particularly for use in intra-oral dental applications, a solid state imager is arranged to detect X-ray radiation from a source after passing through an object. Prior to irradiation by the source, charge accumulated in the elements of a CCD is clocked from two or more rows into a register such that charges are summed. The register is output via a charge amplifier which sums the charge applied to it to give a relatively large output signal which is amplified and applied to thresholder. Onset of X-ray irradiation is detected when the signal applied to the thresholder exceeds a reference level. A start signal is then transmitted to a control unit to cause image acquisition to begin.

REFERENCES:
patent: 4694316 (1987-09-01), Chabbal
patent: 5053873 (1991-10-01), Taniji
patent: 5513252 (1996-04-01), Blaschka et al.
patent: 5693948 (1997-12-01), Sayed et al.
N. G. Loter, P. Burstein, A. Krieger, D. Ross, D. Harrison, D. J. Michaels, "Soft x-ray and XUV imaging with a charge-coupled device (CCD)-based detector, " Solid State Imagers for Astronomy, Proc. SPIE vol. 290, pp. 58-61, 1981.

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