Subjective Contrast of Pulmonary Tissues in CsI-FPD Chest Radiography Using Model Phantom by Monte Carlo Simulation

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  • Oda Nobuhiro
    Emeritus Professor, Kyoto College of Medical Science
  • Uehara Shuzo
    Emeritus Professor, Kyushu University
  • Nakano Tsutomu
    Department of Radiology, Kitakyushu Munakata Chuo Hospital
  • Ideguchi Tadamitsu
    Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
  • Sakamoto Hajime
    Department of Radiological Technology, Faculty of Health Science, Juntendo University
  • Tabata Yoshito
    Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science
  • Akazawa Hiroyuki
    Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science
  • Aoki Takatoshi
    Department of Radiology, University of Occupational and Environmental Health, School of Medicine

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Other Title
  • 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FPD胸部撮影における肺組織の被写体コントラスト
  • 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 FPD キョウブ サツエイ ニ オケル ハイ ソシキ ノ ヒシャタイ コントラスト

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<p>Objective: Subject contrast of pulmonary tissues was investigated for five X-ray beams (70 kV without filter, 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-FPD chest radiography using two types of model phantoms by Monte Carlo simulation. Methods: A total of 72 million photons were entered to the model lung phantom (width, 300 mm; length, 300 mm; thickness, 200 mm; air space, 120 mm) and model mediastinum phantom (width, 300 mm; length, 300 mm; thickness, 200 mm; air space, 40 mm). Individual primary and secondary photon’s process (absorption, scattering, and penetration) in the phantom and CsI-detector was recorded by Monte Carlo simulation. Subject contrast was calculated by entered and absorbed photon’s number in the CsI-detector. Results: Subject contrast pulmonary tissues were high to low energy X-ray beam; however, the ones of soft tissue and soft tissue overlaying bone had few differences for beam quality except 70 kV without filter. Moreover, the subject contrast by absorbed photons was higher compared to the one by entered photons in CsI. Conclusion: It was shown that the subject contrast study by Monte Carlo calculation can be replaced by the way of physical chest phantom, and that the subject contrast by absorbed photons and by injected photons in CsI was different. Furthermore, be verified that the subject contrast of soft tissue and soft tissue overlaying bone differs hardly.</p>

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