A detector for a dark-field and/or phase-contrast interferometric imaging system comprises pixels, first detector arrays, second detector arrays, and a processor. For each pixel, each of the first and second detector arrays is configured to detect a cumulative charge associated with fingers of the respective detector array. For each pixel, the processor is configured to assign an X-ray interaction event to either the first detector array or the second detector array based on the detector array that has the highest cumulative charge.