Digital radiography system using a new direct-detection flat panel detector and its system performance

Jong-Hwan Park; Won-Suk Kang; Byung-Su Shin; Hyun-Seung Kang

doi:10.1117/12.812273

13 March 2009 Digital radiography system using a new direct-detection flat panel detector and its system performance

Jong-Hwan Park, Won-Suk Kang, Byung-Su Shin, Hyun-Seung Kang

Proceedings Volume 7258, Medical Imaging 2009: Physics of Medical Imaging; 72585P (2009) https://doi.org/10.1117/12.812273
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

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.

Citation Download Citation

Jong-Hwan Park, Won-Suk Kang, Byung-Su Shin, and Hyun-Seung Kang "Digital radiography system using a new direct-detection flat panel detector and its system performance", Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72585P (13 March 2009); https://doi.org/10.1117/12.812273

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