X-ray imaging system including brightness control

X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling

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378 982, 378 987, H05G 164

Patent

active

055330878

ABSTRACT:
X-ray imaging system is arranged such that the exit screen of the X-ray image intensifier can be imaged, via a beam deflection element, on a pick-up device (CCD sensor) and on a photodiode for automatic dose control or exposure timing. Because the beam deflection element (prism, partly transparent cube or mirror) covers the entire cross-section of the exit screen, a uniformly illuminated exit screen is imaged on the pick-up device as a uniformly illuminated surface. When the pick-up device is arranged transversely of the prolongation of the X-ray image intensifier and the photodiode is arranged in the prolongation of the X-ray image intensifier, a compact system is obtained. When use is made of an anamorphic system comprising two prisms, a part of the light beam can be reflected to the photodiode from a surface of a prism. More accurate exposure timing can be achieved by measurement of the light reflected by the CCD sensors.

REFERENCES:
patent: 4210812 (1980-07-01), Ando et al.
patent: 4472826 (1984-09-01), van de Ven
patent: 4857724 (1989-08-01), Snoeren
patent: 4872747 (1989-10-01), Jalkio et al.
patent: 5177777 (1993-01-01), Niino

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