Device for scanning an X-ray image

Details Device for scanning an X-ray image Device for scanning an X-ray image

1991-02-12

1992-03-17

Howell, Janice A.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378 28, 378 29, 378 32, 358111, G03G 13044

Patent

active

050974939

ABSTRACT:
A plurality of electrometer probes scan the charge pattern of a photoconductor (1), the distance between the electrometer probes (6) and the photoconductor (1) being measured via an alternating voltage applied to the photoconductor (1). The alternating voltage is scanned by the electrometer probes and is filtered out to extract distance measuring signals. The output signals of all electrometer probes (6) are used for determining image values of the X-ray image, the output signals of at least some of the electrometer probes (6) also being used, via a suitable filter (23), for determining the distance measuring signals. An adjusting device adjusts the distance between the electrometer probes (6) and the photoconductor (1) continuously to a reference value, in dependence on the value of the measuring signals, during the scanning operation.

REFERENCES:
patent: 4134137 (1979-01-01), Jacobs et al.
Proceedings of SPIE-The International Society for Optical Engineering, "Image Quality in Selenium-Based Digital Radiography", vol. 626, 1986, pp. 176-184.

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