Relationship Between Image Quality and Signal Detectability in CR and FPD Systems

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  • Kawaharada Miho
    Hiroshima International University, Graduate School of Medical Technology and Health Welfare Sciences, Major in Medical Engineering and Technology
  • Ishida Takayuki
    Hiroshima International University, Graduate School of Medical Technology and Health Welfare Sciences, Major in Medical Engineering and Technology
  • Okura Yasuhiko
    Hiroshima International University, Graduate School of Medical Technology and Health Welfare Sciences, Major in Medical Engineering and Technology
  • Kawashita Ikuo
    Hiroshima International University, Faculty of health Sciences, Department of Clinical Radiology

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Other Title
  • ＣＲとＦＰＤにおける画質と信号検出能の関係
  • CR ト FPD ニ オケル ガシツ ト シンゴウ ケンシュツノウ ノ カンケイ

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Abstract

With the screen/film X-rays imaging system, Wakamatsu et al. reported that there was a close relationship between the square root of spectral signal-to-noise ratio area and sensitivity measure d’ in receiver operating characteristic (ROC) analysis. In this study, we investigated the relationship between image quality and signal detectability in two digital X-ray imaging systems using computed radiography (CR) and a flat panel detector (FPD). We used urethane resin balls with a diameter of 2 mm as a signal for cases samples in ROC analysis. In this experiment, the square root of the spectral signal-to-noise ratio area was closely related to d’ in ROC analysis in both digital X-ray imaging systems. In addition, when the exposure dose increased, signal detectability improved, but then saturated at one level. These results suggest that the exposure dose can be reduced when the optimal dose setting can be determined.

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