A Pilot Study on Radiation Dose from Combined Mammography Screening in Australia

摘要

This article presents the results of a pilot dose survey including fifty patients who underwent combined screening: full field digital mammography (FFDM) plus digital breast tomosynthesis (DBT). The study also aimed to demonstrate the different dosimetric outcome from using different glandularity assumptions and dosimetry methods. The mean glandular dose to each patient was computed using Dance's method with UK glandularity assumption. The calculations were repeated using Wu/Boone's method with the "50-50" breast assumption and the results compared to those using Dance's method. For the typical breasts, the dose from combined examination was around 9.56 mGy: 4.26 mGy from two-view FFDM and 5.30 mGy from two-view DBT. Adopting UK glandularity assumption was believed to more realistically reflect the population dose. The comparison between Dance's and Wu/Boone's methods indicated that the latter tended to show lower dose values with mean differences of -3.6 % for FFDM and -5.5 % for DBT.