| 摘要 |
<p>The present invention relates to modulating a generated X-ray beam. In order to provide an increased, i.e. faster, periodic modulation of the X-ray intensity, an anode disk (28) for a rotating anode in an X-ray tube for modulating a generated X-ray beam is provided, the anode disk comprising a circumferential target area (34) with a target surface area, a focal track centre line (38), and a beam-dump surface area. The target surface area is provided such that, when being hit by an electron beam, X-rays for X-ray imaging can be generated; and the beam-dump surface area is provided such that, when being hit by an electron beam, no useful X-rays for X-ray imaging can be generated. The target surface area comprises a plurality of target portions (80,82), and the beam-dump surface area comprises a plurality of beam-dump portions (88). The target portions and the beam-dump portions are arranged along the focal track centre line such that a centre of a focal spot, in which X-ray radiation is generated, is located on the focal track centre line. Further, the structures on both sides of the focal track centre line are arranged such that same radiation intensities are provided on the both sides when being hit by a homogenous electron beam. Additionally it is provided that at least a part of the target surface area comprises target portions and beam-dump portions in an alternating manner in the direction of the focal track centre line.</p> |
