X-ray image intensifier tube comprising a selective filter

Details X-ray image intensifier tube comprising a selective filter X-ray image intensifier tube comprising a selective filter

1990-01-08

1991-04-16

O'Shea, Sandra L.

Electric lamp and discharge devices

Photosensitive

With optical device

313527, 2504871, H01J 4018, G01N 2164

Patent

active

050085913

ABSTRACT:
The entrance screen in an X-ray image intensifier includes an intermediate layer of a material which selectively absorbs photon energy. As a result, the speed of the photo-electrons is substantially reduced, thus improving the imaging. By introducing a radial variation of the absorption in the intermediate layer, vignetting-compensation can also be realized without substantial loss of sensitivity and resolution for the central portion of the tube. The resolution at the periphery of the tube can thus be substantially improved.

REFERENCES:
patent: 3706885 (1972-12-01), Fister et al.
patent: 3838273 (1974-09-01), Cusano
patent: 4398093 (1983-08-01), Dufay

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