X-ray diagnosis apparatus for transverse layer images

Claim 1

An x-ray diagnostic apparatus for producing transverse layer images of a radiographic subject, comprising an x-ray measuring arrangement including an x-ray source for producing an x-ray beam penetrating a transverse layer region of a radiographic subject with the beam having a cross-sectional extent perpendicular to the plane of the layer region generally equal to the layer thickness, and a radiation receiver for determining the radiation intensity issuing from the layer region; a convertor connected to the radiation receiver for transforming the signals delivered by the radiation receiver into a tomographic image; the x-ray source comprising a ring-shaped anode arrangement, and a series of cathodes being arranged opposite the anode arrangement; and beam shifting means for changing the direction of the symmetry axis of the x-ray beam comprising means for the stepwise switching on of electron radiation between at least one cathode in each instance and the anode arrangement; the radiation receiver being of a ring configuration for surrounding the layer region and being disposed radially inwardly relative to the x-ray source, and comprising a series of individual detectors; characterized in each detector (30 through 35, etc.) being adjustably mounted such that it can be brought, independently of the other detectors, from a position clear of the x-ray beam (9) into a position in which it is impinged upon by the x-ray beam (9), and a device (37 through 42) being coupled with said detectors for effecting the detector adjustment in dependence upon the respective position of the symmetry axis (8) of the x-ray beam (9) such that the x-ray beam (9) initially passes by the detectors (30 through 35, etc.), and then impinges upon a corresponding selectable number of detectors (30 through 35, etc.).