X-ray image intensifier having variable-size fluorescent crystal

Details X-ray image intensifier having variable-size fluorescent crystal X-ray image intensifier having variable-size fluorescent crystal

1988-03-11

1989-11-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313525, H01J 3150

Patent

active

048809659

ABSTRACT:
An X-ray image intensifier includes a vacuum envelope having an input window for receiving X-rays, an input fluorescent screen for converting X-rays received through the input window into light, a photoelectric layer for converting the light, which was converted by the input fluorescent screen, into electrons, an anode and a converging electrode constitute an electron lens for accelerating and converging the electrons converted by the photoelectric layer, and an output fluorescent screen for converting the electrons, which were accelerated and converged by the electron lens, into a visible image. The light transmission coefficient of a peripheral portion of the input fluorescent screen is larger than that of a central portion thereof.

REFERENCES:
patent: 3716713 (1973-02-01), Levin
patent: 3829728 (1974-08-01), Gudden et al.
patent: 3838273 (1974-09-01), Cusano
patent: 4437011 (1984-03-01), Noji et al.
Japanese Patent Abstract, vol. 2, No. 134, Nov. 9, 1978, p. 8327 E 78; & JP-A-53 102 663 (Tokyo Shibaura Denki K.K.).

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