A study on the consistency between the measured value of mammary gland measurement software and visual judgment

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  • Kai Toshihiro
    The Investigative commission of Breast Cancer Screenig in Saitama Shintoshin Ladies’ Mammoclinic
  • Ninomiya Jun
    The Investigative commission of Breast Cancer Screenig in Saitama Ninomiya Hospital, Surgery
  • Saito Tsuyoshi
    The Investigative commission of Breast Cancer Screenig in Saitama Saitama Red Cross Hospital, Breast Surgery
  • Nakano Satoko
    The Investigative commission of Breast Cancer Screenig in Saitama Kawaguchi Municipal Medical Center, Breast Surgery
  • Yagata Hiroshi
    The Investigative commission of Breast Cancer Screenig in Saitama Saitama Medical Center, Breast Surgery

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  • 乳腺量測定ソフトの特徴と「みかけ高濃度」群，「相対的低濃度」群における測定値補正の試み

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The software for quantification of breast density measures the breast density in each pixel, based on the data in mammography images and the imaging conditions. The software has realized the function of measuring the “area ratio of mammary gland tissue to the fat tissue within the entire breast mammogram（hereinafter, FG%）.” In particular, the FG% is an epoch-making parameter, that is highly useful for determining the breast composition in Japan. We sought to assess the breast composition assessment threshold using right mediolateral oblique（MLO）images from 433 patients. However, discrepancies between the FG% and visual assessment were noted in some of the images. We identified compressed breast thickness（hereinafter, CBT）and amount of subcutaneous fat as the reasons for these discrepancies. The CBT and FG% were inversely correlated. In mammary glands with a small CBT, the amount of fat is also small, and the FG% value is higher than the visually observed value. A CBT of less than 30mm is classified as “apparently high breast density.” On the other hand, there was a group with very large amounts of subcutaneous fat to ignore its impact. In the analysis of the amount of fat in the breast, a CBT of 46mm was defined as a “relatively low breast density, ” in which the FG% values were lower than the visually observed values. In this group, patients with an intramammary extragland fat area（hereinafter, ExFat）of ≥200cm3 in the breast were considered to have extremely high amounts of subcutaneous fat. In the groups of patients with “apparently high breast density, ” with a CBT of < 30mm and “relatively low breast density, ” with a CBT of ≥46mm, patients with ExFat values of ≥200cm3 were subjected to correction of the measured FG% values. As a result, the κ coefficient with the visual assessment by the author increased from “moderate concordance ” to “high concordance. ” With this correction, the usefulness of the FG% as an assessment measure is expected to increase, with reduces discrepancies from the visual assessment.

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