Automatic brightness control for direct view fluoroscopic imagin

Details Automatic brightness control for direct view fluoroscopic imagin Automatic brightness control for direct view fluoroscopic imagin

1978-07-17

1979-10-16

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

With means to inspect passive solid objects

250409, H05G 136

Patent

active

041714849

ABSTRACT:
An apparatus and method for controlling an X-ray generator in order to obtain a relatively constant output window brightness from a directly viewed X-ray image intensifier tube by introducing a small sinusoidal variation to the bias supply of the image intensifier tube and detecting only the resultantly modulated light component output from the phosphor display screen, the error signal thus derived being independent of dark current and power frequency components common to X-ray generated light output of the image intensifier tube.

REFERENCES:
patent: 2541187 (1951-02-01), Ball et al.
patent: 2821635 (1958-01-01), Ball et al.
patent: 2829273 (1958-04-01), Fransen
patent: 3198947 (1965-08-01), Arrison, Jr. et al.
patent: 3675020 (1972-07-01), Sieband

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