Nihon Nyugan Kenshin Gakkaishi (Journal of Japan Association of Breast Cancer Screening)
Online ISSN : 1882-6873
Print ISSN : 0918-0729
ISSN-L : 0918-0729
Original Articles
Assessment of Digital Breast Tomosynthesis Exposure Dose According to Differences in Breast Composition and Image Acquisition Method
Akihiro Kanoh
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2018 Volume 27 Issue 2 Pages 167-172

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Abstract

There have been many reports regarding radiation exposure dose evaluations of digital breast tomosynthesis(DBT)that have assumed standard breast composition, but few reports have taken differences in breast composition into account. In this study we therefore assessed DBT radiation exposure dose ratios in relation to 2D mammography(DBT/2D)by taking differences in breast composition, i.e., breast thickness and mammary gland density, and image acquisition method into account. The results showed that the DBT/2D ratios varied from about1to 5 times according to breast composition and image acquisition method, but the values tended to decrease with increasing breast thickness and breast density, and to increase with increasing size of the oscillation angle. There are problems to be surmounted in the future, including in regard to image quality evaluation, but from the standpoint of radiation exposure, the results suggested the usefulness of DBT for dense breasts.

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