Image Quality and Detection Performance of a Direct Digital Radiography System

DOI Web Site PubMed 9 Citations 26 References
  • IDEGUCHI TADAMITSU
    Department of Radiology, Clinical Research Institute, National Hospital Organization Kyushu Medical Center
  • MATSUDA KATSUHIKO
    Department of Radiology, Saiseikai Kumamoto Hospital
  • HIMURO KAZUHIKO
    Department of Radiology, Kyushu University Hospital
  • KUWAHARA RIE
    Department of Radiology, Saiseikai Kumamoto Hospital
  • MIYAZAKI HIDETSUNE
    Department of Radiology, Saiseikai Kumamoto Hospital
  • HAZEYAMA HIROYUKI
    Department of Radiology, Saiseikai Kumamoto Hospital
  • KUMAZAWA SEIJI
    Department of Radiological Sciences, School of Health Sciences, Faculty of Medicine, Kyushu University
  • KAWAJI YASUYUKI
    Department of Radiology, National Hospital Organization Nagasaki Medical Center
  • YOSHIDA AKIRA
    Department of Nursing, Faculty of Health and Welfare, Prefectural University of Hiroshima
  • MATSUMOTO MASAO
    Division of Allied Health Science, Graduate School of Medicine, Osaka University
  • HIGASHIDA YOSHIHARU
    Department of Radiological Sciences, School of Health Sciences, Faculty of Medicine, Kyushu University

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Other Title
  • 直接型ＦＰＤの画質特性と検出特性
  • チョクセツガタ FPD ノ ガシツ トクセイ ト ケンシュツ トクセイ

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Abstract

The physical characteristics of a direct amorphous Selenium (a-Se) digital fluoroscopy and radiography system were investigated. Pre-sampled modulation transfer functions (MTF) were measured using a slit method. Noise power spectra were determined for different input exposures by fast Fourier transform of uniformly exposed samples. The MTFs of direct digital radiography systems showed significantly higher values than those of indirect digital radiography and screen-film systems. The direct digital radiography systems showed higher noise levels compared with those of indirect systems under roughly the same exposure conditions. Contrast-detail analysis was performed to compare detection by direct digital radiography systems with that of the screen-film (FUJI HG-M2/UR2) systems. The average contrast-detail curves of digital and film images were obtained from the results of observation. Image quality figures (IQF) were also calculated from the individual observer performance tests. The results indicated that digital contrast-detail curves and IQF are, on average, are equal those of the screen-film system.

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