Propose for the Benchmark Dose (BD) for the Optimization of Protection in Medical Exposure in General Radiography

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  • Watanabe Hiroshi
    Department of Radiological Technology, Japan Organization of Occupational Health and Safety,Yokohama Rosai Hospital (Current address: School of Radiological Sciences, Faculty of Health Science, Gunma Paz University)
  • Seki Masashi
    Department of Radiology, Kitasato University Hospital
  • Nitta Masahiro
    Diagnostic Imaging Center, St. Marianna University School of Medicine Hospital
  • Serita Itsuki
    Diagnostic Imaging Center, St. Marianna University School of Medicine Hospital
  • Maehara Yoshiaki
    Radiation Control Office, St. Marianna University School of Medicine Hospital
  • Okura Hideaki
    Department of Radiology, Yokohama Shin-Midori General Hospital
  • Murakami Tomofumi
    Department of Radiological Technology, Yokohama City University Hospital
  • Yamamoto Kazuyuki
    Department of Radiological Technology, Tokai University Hospital
  • Sato Tsutomu
    Department of Radiological Technology, Japan Organization of Occupational Health and Safety,Yokohama Rosai Hospital (Current address: School of Radiological Sciences, Faculty of Health Science, Gunma Paz University)
  • Tajima Ryuto
    Department of Radiological Technology, Tokai University Hachioji Hospital

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Other Title
  • 一般撮影の医療被ばくの防護を最適化するためのベンチマークドーズ(BD)の提案
  • イッパン サツエイ ノ イリョウ ヒバク ノ ボウゴ オ サイテキカ スル タメ ノ ベンチマーク ドーズ(BD)ノ テイアン

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<p>The goal of this research was to create the most appropriate index dose for the optimization of protection in medical exposure in general radiography in Kanagawa prefecture. We distributed questionnaires to 272 medical institutions in Kanagawa prefecture. The investigation period was from October 2015 to February 2016. Entrance surface dose (ESD) was used as the index dose. Investigated regions in general radiography were the adult chest, adult abdomen, and infant chest (anterior-posterior projections for all regions). The effective response rate was 35%. ESD was significantly lower with a flat panel detector (FPD) than with computed radiography (CR) in all regions (adult chest and abdomen: p<0.001; infant chest: p<0.05) [e.g., mean (±standard deviation) ESD in the adult chest was 0.16±0.06 mGy with FPD and 0.24±0.10 mGy with CR]. In the infant chest with CR, ESD was significantly higher using a grid (0.15±0.07 mGy) compared to not using a grid (0.10±0.05 mGy; p<0.05). Based on these results, we propose the benchmark dose of each medical equipment, such as adult chest: FPD, 0.2 mGy; CR, 0.3 mGy.</p>

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