MTF and DQE measurement in imaging detectors by their single-event response

The single-event response of imaging detectors, averaged and normalised, can furnish the PSF and then the MTF of the detector. Moreover, the analysis of the single-event responses makes it possible to measure the fluctuation of the output signal intensity and to express the output noises in terms of quantum responses. Therefore, if the variances of the involved noises, the quantum efficiency QE and the average input signal are known, the DQE of the detector can be determined. Experimental results are shown using a CCD-based X-ray scintillation area detector in the 8–45 keV range.