Tomographic apparatus for the production of transverse layer images

Claim 1

Tomographic apparatus for the production of transverse layer images of a radiography subject, comprising a radiation measuring arrangement with a plurality of x-ray sources each of which generates an x-ray beam penetrating the radiography subject, the cross-sectional extent of each said x-ray beam, perpendicular to the layer plane, being approximately equal to the layer thickness, and with a radiation receiver which determines the radiation intensity behind the subject, a rotating frame for rotating the x-ray sources in the layer plane for the scanning of the radiography subject from different projections, and a measured value converter for transformation of the signals delivered by the radiation receiver into a layer image, a high voltage transformer operated with a medium frequency which is higher than the mains frequency, a high voltage circuit for energizing said plurality of x-ray sources, said high voltage circuit (15) being mounted on said rotating frame and comprising the secondary of the x-ray high voltage transformer, said plurality of x-ray sources comprising grid-controlled x-ray tubes (6, 7, 8) each connected with said high voltage circuit, filament transformers (12, 13, 14) for respectively supplying filament current to said grid-controlled x-ray tubes, a plurality of separate housings (9, 10, 11) on said rotating frame containing said grid-controlled x-ray tubes and said filament transformers, and a grid control circuit (18) connected with the grids of said grid-controlled x-ray tubes on the rotating frame (1) for controlling pulsing operation of said x-ray sources during scanning.