Method and apparatus for correcting artifacts during generation of X-ray images, in particular computed tomography, or radiography by means of temporal modulation of primary radiation

摘要

Artifacts caused by scattered radiation when generating X-ray images of objects are corrected using a temporally alterable modulation of the primary radiation. A respective set of originally amplitude-modulated modulation projections of the object is generated and a respective scattered image allocated to the respective modulation projections is calculated. The method is particularly suitable for fast CT scans.

主权项

1. A method for correcting artifacts in an X-ray projection of an object, comprising:
generating X-rays from a primary X-ray source with a repeating pattern of regions with different X-ray signal strengths to obtain amplitude modulated X-rays with temporal alterations; detecting, by a detector as a complete signal, the amplitude-modulated X-rays after passing through the object to be imaged; and calculating a scattered image, separated from an original, amplitude-modulated projection, from the complete signal, such that a number (j=1 . . . NMod) is generated from modulation projections allocated to a respective point in time.