Effect of the Anti-scatter Grid on the Detective Quantum Efficiency in Digital Mammography

Detective quantum efficiency (DQE) is a frequency dependent measure of the efficiency of a digital detector in converting incident x-ray energy into an image signal. The anti-scatter grid’s effect on DQE for amorph selenium (a-Se) detector-based full-field digital mammography was examined in this study. DQE measurements were carried out with and without an anti-scatter grid as described in the IEC 62220-1-2 standard using a 1.0 mm thick tungsten edge test tool when determining the modulation transfer function (MTF). In conclusion, the maximum DQE determined using an anti-scatter grid-in geometry was approximately 35 % lower than the maximum DQE measured using a grid-out geometry. The highest difference was calculated at 3.0 $\mathrm{mm}^{-1}$ spatial frequency, roughly 40%.