Diagnostic radiology apparatus for producing layer images

Claim 1

Diagnostic radiology apparatus for producing layer images of a radiography subject, comprising a patient support, a measuring arrangement for irradiating the radiography subject from various directions, comprised of a radiation source (2) which emits a fan-shaped radiation beam penetrating the layer to be examined, whose dimension perpendicular to the layer plane is approximately equal to the layer thickness, and of a radiation receiver (3) formed of a series of detectors, which delivers electric output signals corresponding to the measured radiation intensity, a rotating frame (1) on which the radiation source and the radiation receiver are mounted, and a transmission network (8) with a video unit (9) for converting the output signals of the radiation receiver into an image of the examined layer, the video unit (9) being operable with a polar coordinate system in which a number of concentric image point circles are written, each of which is locally allocated, via the transmission network (8), to a specific detector in the radiation receiver (3) and is modulated in its intensity largely corresponding to the output signal of the associated detector, and means (11) for synchronizing the recording operation of the video unit with the scanning movement of the measuring arrangement (2, 3) such that the circles are completely recorded when a scan cycle is terminated.