Abstract: X-ray examination apparatus includes a detector array 32 for the detection of the light beam 10. The array is set up in such a manner that image information from substantially the entire output screen of an X-ray image-intensifier tube incorporated in the apparatus can be detected. The detector array is used for brightness control and for adaptation of the quantities influencing the image quality. Use is made of a measured field which can be programmed spatial image imformation can also be used by the matrix form of the detector.

Abstract: An image-forming device, comprising an image intensifier tube, includes a magnetic shielding grid comprising a ferromagnetic material, which is arranged near the entrance screen of the image intensifier tube for the purpose of shielding against disturbing magnetic fields. Due to the use of partly radiation absorbing material and partly ferromagnetic material this shielding grid can replace, a stray radiation grid already present in the device, or can be added as a grid with radiation transmitting material and ferromagnetic material without the image formation being disturbed in any way.