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Stability of a spectral calibration model with non-linear intensity correction for photon-counting detectors

This work extends the methodology for estimating spectral response of photon-counting detectors (PCDs) from transmission measurements through an object of known composition and geometry. The extension incorporates a non-linear model that relates the photon counts incident on the PCD with the photon counts registered by the PCD. The model calibration is performed on an actual step-wedge phantom and it used to predict Xray transmission through a different material than what comprises the phantom. In addition, stability of the determination of the model parameters is investigated, and this analysis is used to determine regularization strength and basis materials for the test object.