Patient doses from screen-film and full-field digital mammography in a population-based screening programme

摘要

The aim of this study was to compare mean glandular dose (MGD) in all full-field digital mammography (FFDM) and screenfilm mammography (SFM) systems used in a national mammography screening program. MGD from 31 screening units(7 FFDM and 24 SFM), based on an average of 50 women at each screening unit, representing 12 X-ray models (6 FFDMand 6 SFM) from five different manufacturers were calculated. The MGD was significantly lower for FFDM compared withSFM (craniocaudal): 1.19 versus 1.27 mGy, respectively, mediolateral oblique: 1.33 versus 1.45 mGy, respectively), but not allof the FFDM units provided lower doses than the SFM units. Comparing FFDMs, the photon counting scanning-slit technologyprovides significantly lower MGDs than direct and indirect conversion digital technology. The choice of target/filtercombination influences the MGD, and has to be optimised with regard to breast thickness.