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An energy‐discriminating capability of a photon counting detector (PCD) can provide many clinical advantages, but several factors, such as charge sharing (CS) and pulse pileup (PP), degrade the capability by distorting the measured x‐ray spectrum. To fully exploit the merits of PCDs, it is important to characterize the output of PCDs. Previously proposed PCD output models showed decent agreement with physical PCDs; however, there were still scopes to be improved: a global model–data mismatch and pixel‐to‐pixel variations.

In this study, we improve a PCD model by using count‐rate‐dependent model parameters to address the issues and evaluate agreement against physical PCDs.

The proposed model is based on the cascaded model, and we made model parameters condition‐dependent and pixel‐specific to deal with the global model–data mismatch and the pixel‐to …