CR マンモグラフィのQA・QC ガイドラインによるCNR(SDNR)の比較

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  • 永見 晶子
    島根大学医学部附属病院放射線部(現鳥取大学医学部附属病院放射線部)
  • 石井 美枝
    島根大学医学部附属病院放射線部(現岐阜医療科学大学保健科学部放射線技術学科)
  • 石井 里枝
    鳥取大学医学部附属病院放射線部(現徳島文理大学保健福祉学部診療放射線学科)
  • 小玉 紗弥香
    島根大学医学部附属病院放射線部
  • 眞田 泰三
    岡山済生会総合病院画像診断科
  • 吉田 彰
    県立広島大学大学院総合学術研究科

書誌事項

タイトル別名
  • Comparison of Contrast to Noise Ratio and Signal Difference to Noise Ratio Based on QA and QC Guidelines in CR Mammography
  • CR マンモグラフィ ノ QA ・ QC ガイドライン ニ ヨル CNR(SDNR)ノ ヒカク

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説明

The measurement methods of contrast to noise ratio (CNR) and signal difference to noise ratio (SDNR) in digital mammography are different among several quality assurance (QA) guidelines, that is, the type of pixel value (PV), phantom shape, location of aluminum plate, and the size of region of interest (ROI) principally differ in data acquisition. We compared CNR (SDNR) obtained from three QA guidelines. They are the European Reference Organisation for Quality Assured Breast Screening and Diagnostic Services (EUREF), the International Electrotechnical Commission (IEC), and the International Atomic Energy Agency (IAEA). In EUREF and IEC, CNR was calculated using linearized pixel value (LPV). In IAEA, because the type of pixel value to use in SDNR was not specified, SDNR was calculated using PV and LPV, and CNR was calculated using LPV. Target/filter combinations are molybdenum/molybdenum (Mo/Mo) and molybdenum/rhodium (Mo/Rh). Applied various tube voltages are 25, 30, and 35 kV, and various phantom thicknesses are 20, 45, and 70 mm of polymethyl methacrylate (PMMA). The PV-SDNR of IAEA showed the largest value among the three methods, following LPV-CNR of IEC, LPV-CNR of EUREF at 20 mm PMMA thickness. In IAEA, SDNR changed by the kind of pixel value (PV or LPV). When CNR is calculated, every researcher should describe the type of guidelines, the kind of pixel value, and formula for calculation.

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