Equalization of Medipix family detector energy thresholds using X-ray tube spectrum high energy cut-off

The Medipix detector family with single photon counting, photon energy discrimination and small pixel size makes it possible to carry out spectral X-ray imaging with high spatial resolution. In these detectors, the energy discrimination is performed independently in each pixel. For a good quality of spectral measurements, it is important that the globally defined energy threshold corresponds to the same energy in each pixel. The possibility of local adjustment of the pixel threshold is implemented by the chip design. In this paper, we present a method for thresholds equalization at an arbitrary energy using the X-ray tube spectrum high energy cut-off as a reference energy point. It is shown that the proposed method reduces the spread of pixel energy thresholds by more than 60 % in the energy range from 15 keV to 55 keV.