Exploring new frontiers in x-ray quantum limited portal imaging using active matrix flat-panel imagers (AMFPIs)

Amit Sawant, Larry E. Antonuk, Youcef El-Mohri, Yixiu Kang, Yixin Li, Zhong Su, Yi Wang, Jin Yamamoto, Qihua Zhao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations


In recent years, indirect detection active matrix flat-panel imagers (AMFPIs) have become the gold standard in radiotherapy imaging. The excellent imaging performance of AMFPI-based electronic portal imaging devices (EPIDs) can be attributed to their ability to perform x-ray quantum limited imaging under radiotherapy conditions. However, all current commercial (AMFPI and non-AMFPI) EPIDs use only ∼1% to 2% of the incident radiation, In this work, strategies to significantly improve the overall performance of indirect detection AMFPI-based EPIDs through novel designs, are presented. Specifically, the focus of this work is on thick, structured stimulators, which achieve high x-ray detection efficiency while simultaneously maintaining spatial resolution. Fundamental signal and noise measurements using prototype, small area, structured scintillators are reported. In addition, theoretical calculations were performed in order to estimate the signal and noise properties of various structured scintillator configurations. Results from theory and experiments were used to estimate the frequency-dependent detective quantum efficiency (DQE). Results suggest that these designs could yield DQE values that are significantly higher than those for current commercial EPID technologies.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsM.J. Yaffe, L.E. Antonuk
Number of pages12
Volume5030 I
StatePublished - 2003
EventMedical Imaging 2003: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 16 2003Feb 18 2003


OtherMedical Imaging 2003: Physics of Medical Imaging
Country/TerritoryUnited States
CitySan Diego, CA


  • Active matrix flat-panel imager
  • DQE
  • MTF
  • Portal imaging

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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