Generalized cascaded model to assess noise transfer in scintillator-based x-ray imaging detectors

For a scintillator-based x-ray imaging detector, the conventional cascaded model is generalized to describe the direct x-ray induced quantum noise. The direct x rays are those that are unattenuated from a scintillator and that directly interact with photosensitive elements. The developed model is applied for an analysis of a photodiode array in conjunction with a phosphor screen and shows a good agreement with the measured noise-power spectrum.