X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1982-12-17
1985-01-08
Smith, Alfred E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, 378 7, A61B 600, H04N 718
Patent
active
044930968
ABSTRACT:
A method of x-ray imaging the internal features of an object undergoing examination in which the object is scanned with a beam of x-ray radiation. The radiation is transmitted through the object as primary imaging radiation and as scatter radiation. The image-degrading effect of scatter radiation is reduced by employing a controlled TV camera tube target erase. The controlled target erase consists of a camera tube target raster scan by an electron beam controlled in the vertical position so as to immediately precede in position on the target the latent image charge pattern moduled thereon by exposure to primary imaging radiation. In this manner, the scatter radiation that leads in position the primary radiation is erased from the target prior to read out and, therefore, does not contribute to the TV image formation. The method is also effective in reducing the effects of electron scatter occurring in an image-intensifier tube and optical scatter occurring in system optical elements.
REFERENCES:
patent: 4220890 (1980-09-01), Beekman
patent: 4380818 (1983-04-01), Pfeiler
patent: 4404591 (1983-09-01), Bonar
General Electric Company
Gerasimow Alexander M.
Grigsby T. N.
Smith Alfred E.
Stoner Douglas E.
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