Comparison of displayed and measured mean glandular dose in digital mammography

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  • Ishii Mie
    Department of Radiological Technology, School of Health Sciences, Gifu University of Medical Science
  • Shinohara Sae
    Graduate School of Health Sciences, School of Health Sciences Kumamoto University (Current affiliation: Canon Medical Systems Corporation)
  • Murakami Noriko
    Department of Radiological Technology, Kitakyushu City Medical Center
  • Ishii Rie
    Department of Radiological Technology, Faculty of Health and Welfare, Tokushima Bunri University
  • Nakamura Mai
    Department of Radiological Technology, Faculty of Fukuoka Medical Technology, Teikyo University
  • Shida Keiichi
    Department of Radiological Technology, Faculty of Fukuoka Medical Technology, Teikyo University
  • Maeda Megumi
    Department of Radiology, Sasebo City General Hospital
  • Okamoto Rumi
    Department of Radiology, Social Medical Corporation Hakuaikai Sagara Hospital
  • Hatada Toshikazu
    Department of Radiological Technology, Kitakyushu City Medical Center
  • Araki Fujio
    Graduate School of Health Sciences, School of Health Sciences Kumamoto University
  • Higashida Yoshiharu
    Department of Radiological Technology, Faculty of Fukuoka Medical Technology, Teikyo University(Current affiliation: one’s home)

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Other Title
  • Digital mammography における平均乳腺線量の表示値と実測値の比較

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Abstract

This study compared the mean glandular dose (MGD) displayed by three types of mammography devices, namely, AMULET F with a Mo target, MAMMOMAT Fusion with a W target, and Senographe DS with Mo and Rh targets, and the MGD measured according to the method proposed by Dance. The dose calculation methods of Dance and Wu are used to calculate the displayed MGDs in the three types of mammography devices. The results showed that when the compressed breast thickness was low, the displayed MGD was less than the measured MGD, and when the breast thickness was higher, the displayed MGD tended to be greater than the measured MGD. The relationship between the measured and displayed MGDs differed depending on the mammography device used. Of the three devices, the Senographe DS, with Mo and Rh targets exhibited a different relationship between the displayed and measured MGDs depending on the target/filter combinations. In summary, the relationship between the displayed and measured MGDs differed depending on both the compressed breast thickness and the mammography device used. However, verification of the relationship between the displayed and measured MGDs may be useful as an index for monitoring patient exposure during mammographies.

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