Comparison of Contrast to Noise Ratio and Signal Difference to Noise Ratio Based on QA and QC Guidelines in CR Mammography

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  • Nagami Akiko
    Department of Radiology, Shimane University Hospital (Current address: Division of Clinical Radiology, Tottori University Hospital)
  • Ishii Mie
    Department of Radiology, Shimane University Hospital (Current address: Department of Radiological Technology, School of Health Sciences, Gifu University of Medical Science)
  • Ishii Rie
    Division of Clinical Radiology, Tottori University Hospital (Current address: Department of Radiological Technology, Faculty of Health and Welfare, Tokushima Bunri University)
  • Kodama Sayaka
    Department of Radiology, Shimane University Hospital
  • Sanada Taizo
    Department of Radiological Technology, Okayama Saiseikai General Hospital
  • Yoshida Akira
    Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima

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  • 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
  • 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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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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