Method of optimizing radiation doses in an X-ray examining devic

Details Method of optimizing radiation doses in an X-ray examining devic Method of optimizing radiation doses in an X-ray examining devic

1977-01-17

1978-07-04

Willis, Davis L.

Radiant energy

Luminophor irradiation

H05G 130

Patent

active

040990583

ABSTRACT:
During the building up of a charge image in the anode layer of the pick-up tube, it is scanned frame-wise by an electron beam at increased cathode potential. As soon as the local quantity of charge exceeds a threshold value which is determined by the cathode potential, an anode current will occur when the relevant position is scanned. This anode current indicates that the illumination of the corresponding position has reached a desired level.
When the cathode voltage is varied during the scanning, a charge image can be scanned with a threshold value adapted to the various parts of the charge image. Underexposure and overexposure of a desired (important) part of the image to be realized are thus precluded.

REFERENCES:
patent: 3567854 (1971-03-01), Tschantz et al.
patent: 3602641 (1971-08-01), Heise

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