Measurement Accuracy of CT Beam Width with a Portable Flat-panel Detector

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  • Ichikawa Nao
    Department of Radiation Oncology, Shiga General Hospital Department of Quantum Medical Technology, Graduate Course of Medical Science and Technology, Division of Health Science, Kanazawa University Graduate School of Medical Sciences
  • Matsubara Kosuke
    Department of Quantum Medical Technology, Faculty of Health Sciences, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University
  • Fukuda Atsushi
    Preparing Section for New Faculty of Medical Science, Fukushima Medical University
  • Yamamoto Hiroyuki
    Department of Radiology, Shiga General Hospital

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Other Title
  • 可搬型FPD を用いたCT 装置におけるビーム幅測定の精度評価
  • カハンガタ FPD オ モチイタ CT ソウチ ニ オケル ビームハバ ソクテイ ノ セイド ヒョウカ

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Abstract

<p>Purpose: X-ray film or computed radiography (CR) system has been employed in clinical setting, and these devices are gradually replaced by portable flat-panel detector (FPD) systems. They may be employed to measure the beam width instead of the traditional CR system. In this study, we estimated the accuracy of beam width measured by the portable FPD system. Method: A CR cassette and FPD were placed at the isocenter, and the pixel values were measured in a single axial CT scanning at a tube potential of 80 kVp, tube currents of 10–40 mA (5 mA steps), and tube rotation time of 0.5 s. Then, the FPD was sandwiched between 0.5 mm copper plate and 2 mm lead plate to avoid the pixel saturation and artifact from the FPD electronic substrates. The beam widths were measured at selected nominal beam widths (40, 80, 120 and 160 mm) using a double exposure technique (tube currents of 10 and 20 mA). Result: Log-linear relationships for two systems were obtained between the pixel value and radiation exposure for parameters less than or equal to 12.5 mAs. A test for the equivalence with confidence intervals showed that the measurement accuracy of the CR and FPD systems was equivalent. Conclusion: The portable FPD system could be utilized for the measurement of the CT beam width as well as CR system.</p>

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