X-ray image pickup tube

Details X-ray image pickup tube X-ray image pickup tube

1994-03-22

1996-05-07

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 19, 250214VT, H01J 4014

Patent

active

055154115

ABSTRACT:
An X-ray image pickup tube converts a transmitted X-ray image into electric signals. The pickup tube includes a target structure having a fluorescent element, and a translucent conductive film for receiving a high voltage, with a photoconductive film laminated thereupon. The fluorescent element receives transmitted X rays in a two-dimensional distribution, and converts them into visible rays in a two-dimensional distribution. The translucnet conductive film is optically coupled to a surface of the fluorescent element opposite from an X-ray incident surface thereof. The photoconductive film includes an amorphors semiconductor layer which converts the visible rays transmitted in a two-dimensional distribution through the translucent conductive film, into electric charges in a two-dimensional distribution, and which multiplies the electric charges in the two-dimensional distribution based on electric fields formed by the high voltage applied to the translucent conductive film. The pickup tube also has a signal reading device in the form of an electron gun or switching elements for scanning a surface of the photoconductive film, as electric signals, a two-dimensional electric potential distribution occurring on the photoconductive film.

REFERENCES:
patent: 4935617 (1990-06-01), Anno et al.
patent: 5117114 (1992-05-01), Street et al.
patent: 5195118 (1993-03-01), Nudelmann et al.
patent: 5302423 (1994-04-01), Tran et al.
patent: 5306907 (1994-04-01), Nudelmann et al.
patent: 5368882 (1994-11-01), Tran et al.

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