Dosimetry using a radiochromic film and a mammography phantom

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  • Tatsuhiro Gotanda
    Kawasaki University of Medical Welfare Faculty of Health Science and Technology, , Okayama, Japan
  • Yasuyuki Kawaji
    Junshin Gakuen University Faculty of Health Sciences, , Fukuoka, Japan
  • Hidetoshi Yatake
    Kaizuka City Hospital Department of Breast Cancer Center, , Osaka, Japan
  • Shinya Imai
    Morinomiya University of Medical Sciences Faculty of Health Sciences, , Osaka, Japan
  • Takuya Akagawa
    Tokushima Red Cross Hospital Department of Radiological Technology, , Tokushima, Japan
  • Toshizo Katsuda
    Shizuoka College of Medical Care Science Medical Radiation Technology, , Shizuoka, Japan

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<jats:title>Abstract</jats:title> <jats:p>Mammography is one of the most effective diagnostic methods for the early detection of breast cancer; however, it poses the risk of radiation exposure. To date, mammography dosimetry has been performed according to the mean glandular dose; however, the actual exposure in the breast has not been assessed. Here, we have measured dose distributions and depth doses using both radiochromic films and mammographic phantoms, and a three-dimensional intra-mammary dose assessment was conducted. The absorbed dose distribution at the surface was markedly higher on the chest wall side but lower on the nipple side. The absorbed doses in the depth direction exponentially decreased. The glandular tissue near the surface may be irradiated with an absorbed dose of 7.0 mGy or higher. Since LD-V1 could be placed inside the phantom, the absorbed dose inside the breast could also be evaluated in three dimensions.</jats:p>

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