U.S. Philips Corporation

Franciscus M Dreesen

Johannes K Colditz

August L Simons

Johnny W Van Der Velden

Martinus A Ligtenberg

Theodorus F Van Bergen

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.

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Heerlen, Netherlands

Franciscus M Dreesen