Patent ID: 7428291

Claim:
An operating method for a medical X-ray apparatus having a recording assembly and a control device, comprising: arranging an X-ray source and an X-ray detector in the recording assembly diametrically opposite one another with reference to a swiveling axis; arranging an aperture device in the recording assembly between the X-ray source and the swiveling axis along a connecting line from the X-ray source to the X-ray detector; positioning an object having an object area constant over time and an object area changing over time in the recording assembly with the object area changing over time located in a vicinity of a crossover area of the swiveling axis and the connecting line; driving the recording assembly for performing a plurality of swiveling operations with at least an overlap angle range by the control device; registering two-dimensional projections of the object in a plurality of angular positions by the X-ray detector; conveying the two-dimensional projections to the control device; storing the conveyed two-dimensional projections along with the corresponding angular positions and status information in the control device; increasing an opening area of the aperture device to a maximum opening diameter of the aperture device during one of the plurality of swiveling operations; and in a remainder of the swiveling operations, closing the aperture device to a second opening diameter that is less than the maximum opening diameter, wherein the closing is effective to show the object area changing over time just in full.