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Precision of the detective quantum efficiency in digital mammography detectors

In digital mammography imaging, the quality of the acquired x-ray images is important in examining the human breast for diagnosis and screening. The noise power spectrum (NPS), modulation transfer function, and detective quantum efficiency (DQE) are usually measured to quantitatively evaluate the detector performance. In this paper, the precision of the NPS and DQE properties of several detectors are observed through extensive experiments. We observed that the precisions of DQE measurements were various depending on the detector and the spatial frequency. For the tested detectors, the precisions were below 4% and the best precision was 2.1% when one image was used to measure one DQE curve. The precision observation can be useful in developing a stable radiography detector.