X-ray imaging system for differential phase contrast imaging- of an object to be examined with phase - stepping as well as angiographic examination method

摘要

The invention relates to an x-ray imaging system for differential phase contrast imaging- of an examination subject (6) with at least one x-ray source (3) for producing quasi-coherent x-ray radiation, a of this (4) with which are arranged in a matrix pixels (22, 23), a diffraction or phase grating (17), which is between the object to be examined (6) and the of this (4) is arranged. According to the invention, the detector of this (4) with a matrix of x total pixels (22) which is structured in such a way that the overall pixel (22) in a analysis direction, which is perpendicular to the grating lines of the diffraction or phase grid (17), in the y subpixel (23) are subdivided into a read-out operation, the control and / or in groups in such a way can be read out,– that in a first phase step n subpixels (25) is operatively connected to be combined to groups, wherein between the groups m subpixel (26) of a total pixels (22) are not detected,– that in the following k-1 phase steps in each case once again n subpixels (23) are combined into groups, to all the necessary combinations of subpixel (23) have been detected, wherein the combined subpixel (25) by a step size of in each case p subpixel (23) are shifted in analysis direction.