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AssigneeU.S. Philips Corporation
InventorsJohannes K. E. Colditz, Willem H. Diemer, Laurens H. J. Jonk, Engelbertus Rongen, Johannes W. J. M. Scheuermann, Henricus M. De Vrieze, August L. H. Simons
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An exit section of an X-ray image intensifier tube, including an the exit phosphor screen, exit window and basic optical system, is optimized so as to achieve a high light yield, low optical aberration and a high resolution. The exit window notably has a pre-compensation geometry for curvature of the image plane of the basic optical system, or the exit window an interference filter, or the exit phosphor layer contains a layer of a comparatively slow phosphor in addition to a layer of a customary phosphor in order to achieve noise-suppressing image integration.
An X-ray examination apparatus comprising an X-ray image intensifier tube, including an exit window means which has a curvature on an outer side and an exit screen optically coupled to an inner side, and a light-optical image transfer system outside said image intensifier tube at a position, spaced from said exit window means, for receiving light output from said exit screen via said exit window means, wherein said exit screen, exit window means and light-optical image transfer system together are an exit section that is operative to form the light output from said exit screen into a substantially aberration-free image-carrying light beam.
Dependencies are inferred from the claim text.