Optimal Beam Quality in Chest Radiography Using CsI-flat Panel Detector for Detection of Pulmonary Nodules

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  • Oda Nobuhiro
    Department of Radiology, Fukuoka School of Health Sciences (Current address: Emeritus Professor, Kyoto College ofMedical Science)
  • 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
  • Asada Yasuki
    Faculty of Radiological Technology, School of Medical Science, Fujita Health University
  • Nakano Tsutomu
    Department of Radiology, Kitakyusyu Munakata Cyuou Hospital
  • Hara Tatsunori
    Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology
  • Kurokawa Yoshiyuki
    Department of Radiological Technology, Tokatsu Clinic Hospital
  • Aoki Takatoshi
    Department of Radiology, School of Medicine, University of Occupational and Environmental Health
  • Uehara Shuzo
    Emeritus Professor, Kyushu University

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Other Title
  • 肺結節の検出を目的としたCsI-FPD 胸部撮影の最適線質
  • ハイ ケッセツ ノ ケンシュツ オ モクテキ ト シタ CsI-FPD キョウブ サツエイ ノ サイテキ センシツ

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Abstract

<p>Objectives: Optimal beam quality for detection of pulmonary nodules in digital chest radiography using CsI-flat panel detector (FPD) was investigated in consideration of image quality and patient dose. Methods: The human chest phantom with inserted imitated nodules (diameter: 10 mm, CT value: +30 Hounsfield unit (HU), –375 HU, –620 HU) was used for the measurement of contrast-to-noise ratio (CNR) of imitated nodules by twenty beams arranged by five tube voltages and four filters. Results: The CNR varies with X-ray tube voltage and added filter. CNR correlates weakly to the tube voltage, fairly to the effective energy in second-order polynomial and strongly to the quality index (effective energy divided X-ray tube voltage). In order to improve the CNR, the effective energy and the quality index are kept about 50 keV and more than 0.5, respectively, using an 80–100 kV beam with a copper filter. Conclusion: A 90 kV (2.5 mm Al inherent filtration) beam with a 0.15 mm copper filter and a 90 kV or 100 kV (2.5 mm Al inherent filtration) beam with a 0.2 mm copper filter are appropriate for chest radiography using CsI-FPD.</p>

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