Study of X-ray Beam Quality and Contrast-to-Noise Ratio of Lung Nodules in Chest FPD Radiography: Monte Carlo Simulation Using Chest Model Phantom

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  • Oda Nobuhiro
    Department of Radiology, Fukuoka School of Health Sciences (Current address: Emeritus Professor, Kyoto College of Medical Science)
  • Uehara Shuzo
    Emeritus Professor, Kyushu University
  • Nakano Tsutomu
    Department of Radiology, Kitakyushu Munakata Chuo Hospital
  • Tabata Yoshito
    Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science
  • Mizuta Masayoshi
    Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science
  • Ideguchi Tadamitsu
    Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
  • Aoki Takatoshi
    Department of Radiology, University of Occupational and Environmental Health, School of Medicine

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Other Title
  • FPD胸部撮影におけるX線線質と肺結節のコントラストノイズ比—胸部ファントムモデルを用いたモンテカルロシミュレーションによる解析—
  • FPD胸部撮影におけるX線線質と肺結節のコントラストノイズ比 : 胸部ファントムモデルを用いたモンテカルロシミュレーションによる解析
  • FPD キョウブ サツエイ ニ オケル Xセンセンシツ ト ハイ ケッセツ ノ コントラストノイズヒ : キョウブ ファントムモデル オ モチイタ モンテカルロシミュレーション ニ ヨル カイセキ

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Abstract

<p>Objectives: Contrast-to-noise ratio (CNR) of four X-ray beams (90 kV with 0.15-mm Cu filter, 90 kV with 0.2-mm Cu filter, 120 kV without filter and 120 kV with 0.2-mm Cu filter) in CsI-flat panel detector (FPD) radiography for lung cancer diagnosis was investigated using Monte Carlo simulation. Method: Two billion photons were injected to the chest phantom model (width: 300 mm, length: 300 mm, thickness: 200 mm) with imitated lung nodules (10 mm diameter, CT value: +30 Hounsfield unit (HU), -375 HU, and -620 HU). Individual primary and secondary photon’s process (absorption, scattering and penetration) in the phantom and CsI-detector was recorded by Monte Carlo simulation. CNR was calculated using primary and secondary absorbed photon’s number in the CsI-detector. Results: CNR of 90 kV X-ray beam with 0.15 mm and 0.2 mm Cu filters was higher to 120 kV X-ray beam because of higher primary object contrast and photon’s contribution, and high photon’s absorption to CsI. Conclusion: By Monte Carlo calculation, it was verified that 90 kV X-ray beam with 0.15 mm and 0.2 mm Cu filters yielded higher CNR to 120 kV X-ray beam.</p>

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