ゲル線量計用光CT 装置の光源色依存性について  [in Japanese] Light source color dependence of optical CT for gel dosimeter  [in Japanese]

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Abstract

We have developed and evaluated a prototype optical computed tomography (CT) systemfor gel dosimetry that measures the amount of irradiation in three dimensions. The majoradvantage of this CT is that the light source color can be changed as required. Theprojection data are obtained using a color camera. The images of the red, green, and bluecomponents can be extracted separately from the color images. Black and white images(brightness values) can also be synthesized from color images. Although optical CT using acolor camera has been reported previously, there have been no reports of optical CT witha variable light source color. In this study, we investigated the influence of light sourcecolor and each color component obtained by the camera on measurements of samples. Theradiochromic dye hydrogel dosimeter has different colors depending on its composition,and its color changes over time. Therefore, we used a sample of blue ink instead of adosimeter in this study. First, the light transmission spectrum of the blue ink samples usedwas investigated. Next, we investigated the relationship between the pixel values of thereconstructed image and the light source color. The blue ink sample showed a large changein transmitted light in the wavelength band of 500 to 700 nm corresponding to colorsmainly in the red region. Next, by changing the color of the light source, we investigatedwhich color component obtained by the color camera was suitable for measurement. Theresults indicated that the red component was suitable for this purpose. When a differentradiochromic dye hydrogel dosimeter is used, it is possible to select a suitable light sourcecolor and a suitable camera color component by measuring the transmitted light spectrumof the gel dosimeter.

Journal

  • Journal of wellness and health care = Journal of wellness and health care

    Journal of wellness and health care = Journal of wellness and health care 43(1), 71-78, 2019-08-01

    Wellness and Health Care Society

Codes

  • NII Article ID (NAID)
    120006709850
  • Text Lang
    JPN
  • Article Type
    departmental bulletin paper
  • ISSN
    2434-1509
  • Data Source
    IR 
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