X-ray diagnostics installation

Details X-ray diagnostics installation X-ray diagnostics installation

1988-09-15

1991-07-02

Church, Craig E.

X-ray or gamma ray systems or devices

Electronic circuit

Exposure timer

378108, H05G 164

Patent

active

050293389

ABSTRACT:
An x-ray diagnostics installation has an image intensifier/video chain for generating a television image of an examination subject. A portion of the light generated by the output screen of the x-ray image intensifier is directed to a semiconductor detector which monitors the average brightness of the output luminescent screen so that the x-ray dose can be accordingly controlled. The detector has a surface on which the entire output image of the x-ray image intensifier can be imaged, and is connected to a control unit which selects a portion of the semiconductor detector surface which will be used to generate the control signal. The detector includes a diaphragm in the form of a liquid crystal matrix, the matrix being controllable by the control unit to selectively admit or block light to the surface of the semiconductor detector, thereby controlling the regions which will be used to generate the control signal.

REFERENCES:
patent: 4185198 (1980-01-01), Fujimoto
patent: 4335307 (1982-06-01), De Vries et al.
patent: 4335311 (1982-06-01), Lutz et al.
patent: 4442538 (1984-04-01), Haendle
patent: 4472826 (1984-09-01), van de Ven
patent: 4517594 (1985-05-01), Horbaschek
patent: 4749257 (1988-06-01), Klausz
patent: 4809309 (1989-02-01), Beekmans

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