It is an objective of the present invention to provide a method for correction of high rate inefficiencies of a single photon counting detector system and single photon counting detector system having this property in order be more precise in terms of photon counting.;This objective is achieved according to the present invention by a method and a single photon counting pixel detector (chip or multi chip), comprising:a) a layer of photosensitive material;b) an N x M array of photo-detector diodes arranged in said layer of photosensitive material; each of said photo-detector diodes having a diode output interface;c) a N x M array of readout unit cells, one readout unit cell for each photo-detector diode;d) said readout unit cell comprising an input interface connected to said diode output interface, a high-gain charge to voltage amplifying means and a pixel counter being connected to an output of the high-gain voltage amplifying means,e) a calculation means for integrating the total number of incident photons over a predetermined total exposure time, wherein the total exposure time is split into sub-exposure intervals, wherein distinct rate corrections are applied to the sub-counts of the sub-exposure intervals and then the number of incident photons is calculated by summing the sub-counts which are individually corrected.
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