1. An X-ray detector, comprising: a regular arrangement of measuring pixels covering a measuring surface, the regular arrangement including two different types of measuring pixels, wherein a plurality of the measuring pixels of the regular arrangement are constructed as direct converting measuring pixels and remaining ones of the measuring pixels are constructed as indirect converting measuring pixels, and wherein at least two adjacent of rows of measuring pixels are direct converting measuring pixels, a row being a plurality of measuring pixels adjacent to one another and extending along the entire measuring surface in a direction of rotation of the x-ray detector, wherein each direct converting measuring pixel includes a detector layer, and wherein the detector layer is provided with a reflective surface at least at boundary surfaces between direct converting measuring pixels and indirect converting measuring pixels.