Quantitative and Visual Image Quality Evaluation between CsI and Gd2O2S:Tb Scintillator Types of Irradiation Side Sampling Flat-Panel Detector Systems for Reduction of Radiation Exposure

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  • Kudo Kohsei
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Osanai Minoru
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Tsushima Megumi
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Hirota Junichi
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Otani Yuhiko
    Department of Radiology, Hirosaki University School of Medicine and Hospital, 53 Hon-cho, Hirosaki, Aomori 036-8563, Japan
  • Naraki Satoshi
    Department of Radiology, Hirosaki University School of Medicine and Hospital, 53 Hon-cho, Hirosaki, Aomori 036-8563, Japan
  • Suzaki Katsumasa
    Department of Radiology, Hirosaki University School of Medicine and Hospital, 53 Hon-cho, Hirosaki, Aomori 036-8563, Japan
  • Aoki Masahiko
    Department of Radiology, Hirosaki University School of Medicine and Hospital, 53 Hon-cho, Hirosaki, Aomori 036-8563, Japan Department of Radiology and Radiation Oncology, Hirosaki University Graduate School of Medicine, 5 Zaifu-cho, Hirosaki, Aomori 036-8562, Japan
  • Hosokawa Yoichiro
    Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan

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<p>Flat-panel detector (FPD) systems have been widely used instead of computed radiography (CR) systems for radiation diagnosis. Indirect FPD systems have either CsI or Gd2O2S:Tb (GOS) types of scintillators. CsI FPDs can achieve comparable image quality whilst using lower dose imaging than GOS FPDs. Additionally, irradiation side sampling FPDs (ISS-FPDs) have better resolution characteristics than penetration side sampling FPDs (PSS-FPDs). In order to investigate exposure dose reduction, an analysis of both quantitative image quality metrics and visual evaluation of CsI and GOS ISS-FPDs was performed. Image quality was evaluated by detective quantum efficiencies and contrast-to-noise ratios, whilst visual evaluation was performed by inverse image quality figures (IQFinv) and area under the curves (AUCs) of the receiver operating characteristic (ROC) curves. The results suggest that CsI can produce comparable images to GOS with a dose reduction of 42-44% according to the image quality evaluation and 37-46% according to the visual evaluation.</p>

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