Journal of the Korean Physical Society

, Volume 66, Issue 12, pp 1926–1935 | Cite as

Characterization of on-site digital mammography systems: Direct versus indirect conversion detectors

  • Hanbean Youn
  • Jong Chul Han
  • Seungman Yun
  • Soohwa Kam
  • Seungryong Cho
  • Ho Kyung KimEmail author


We investigated the performances of two digital mammography systems. The systems use a cesium-iodide (CsI) scintillator and an amorphous selenium (a-Se) photoconductor for X-ray detection and are installed in the same hospital. As physical metrics, we measured the modulationtransfer function (MTF), the noise-power spectrum (NPS), and the detective quantum efficiency (DQE). In addition, we analyzed the contrast-detail performances of the two systems by using a commercial contrast-detail phantom. The CsI-based indirect conversion detector provided better MTF and DQE performances than the a-Se-based direct conversion detector whereas the former provided a poorer NPS performance than the latter. These results are explained by the fact that the CsI-based detector used an MTF restoration preprocessing algorithm. The a-Se-based detector showed better contrast-detail performance than the CsI-based detector. We believe that the highfrequency noise characteristic of a detector is more responsible for the visibility of small details than its spatial-resolution performance.


Digital mammography Cesium iodide Amorphous selenium MTF NPS DQE Contrast 


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Copyright information

© The Korean Physical Society 2015

Authors and Affiliations

  • Hanbean Youn
    • 1
  • Jong Chul Han
    • 1
  • Seungman Yun
    • 1
  • Soohwa Kam
    • 1
  • Seungryong Cho
    • 2
  • Ho Kyung Kim
    • 1
    • 3
    Email author
  1. 1.School of Mechanical EngineeringPusan National UniversityBusanKorea
  2. 2.Department of Nuclear and Quantum EngineeringKorea Advanced Institute of Science and TechnologyDaejeonKorea
  3. 3.Center for Advanced Medical Engineering ResearchPusan National UniversityBusanKorea

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