An X-ray detector comprises an array of pixels, each comprising a sensitive area, a body structure, and an electric circuitry. The sensitive areas are attached to, and arranged on, the body structure. The electric circuitry controls and reads out the sensitive areas and connects the sensitive areas with a processing unit. The sensitive areas provide an electric signal representing X-rays hitting the pixel. All pixels are provided in a pixel layout with a pixel layout scheme where the sensitive area is a first part of the pixel's surface that is contributing to the pixel's signal and a second part of the pixel's surface is irrelevant to contributing to the pixel's signal. To facilitate avoiding visual artifacts, the sensitive areas in a pattern in which at least a part of the pixels having the same pixel layout scheme such that the pixel layout of adjacent pixels is arranged differently.