Reproducibility of Dynamic Chest Radiography with a Flat-panel Detector -Respiratory Changes in Pixel Value-

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  • Kawashima Hiroki
    Division of Health Sciences, Radiology, Graduate School of Medical Science, Kanazawa University
  • Tanaka Rie
    Depertment of Radiological Technology, School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Sanada Shigeru
    Depertment of Radiological Technology, School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University

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Other Title
  • 胸部Ｘ線動態撮影の再現性の検証‐ピクセル値の呼吸性変化‐
  • 胸部X線動態撮影の再現性の検証--ピクセル値の呼吸性変化
  • キョウブ Xセン ドウタイ サツエイ ノ サイゲンセイ ノ ケンショウ ピクセルチ ノ コキュウセイ ヘンカ

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Abstract

Dynamic chest radiography using a flat panel detector (FPD) with a large field of view is expected to be a useful pulmonary functional evaluation method based on the respiratory changes in pixel value. For clinical use as a follow-up and therapeutic evaluation tool, the system must have a high degree of reproducibility in measurements of pixel values. The present study was performed to investigate the reproducibility of respiratory changes in pixel values. Dynamic chest radiographs of five normal subjects and one patient were obtained. Imaging was performed twice in each subject. The slope (X-ray translucency variation) was then calculated from the changes in pixel value from distance lung apex-diaphragm, and the slopes of two sequences were compared. The results showed there were no significant differences in changes in pixel value between the two sequences in all normal subject (5 males, p>0.05). The results indicated that the present method has reproducibility for measuring pulmonary function and also has potential as a tool for follow-up and therapeutic evaluation.

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