We developed a digital radiography (DR) system using a new amorphous selenium (a-Se) based direct-detection flatpanel
detector which has a pixel pitch of 0.168mm, a fill factor of 83%, and a total active imaging area is 17"×17". Our
new system consists of an X-ray generator, two flat-panel detectors, an X-ray tube, a bucky stand, a bucky table, a
control box, an image processing unit and another component. The performance of this imaging system has been
measured and compared with that of our previous system used an a-Se based flat-panel detector, however, which has a
pixel pitch of 0.139mm, a fill factor of 82% and a total active imaging area of 14"×17". In order to evaluate the system
performance quantitatively, the modulation transfer function (MTF), detective quantum efficiency (DQE) and noise
power spectrum (NPS) were measured. At 3.0 lp./mm, the measured MTF was 56%, and DQE were 25% approximately
for a new flat-panel detector. In case of the previously used flat-panel detector, the MTF and DQE at 3.0 lp./mm were
75% and 12%, respectively. The MTF of a new flat-panel detector was lower than that of a previous detector, however
DQE of a new detector was higher than that of a previous detector at whole spatial frequency region. In conclusion, our
new DR system is capable of providing good image quality in aspect of the physical characteristics although the MTF is
relatively lower than previously developed system.
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