B-0816 Breast tomosynthesis versus digital mammography: evaluation of diagnostic potential in women with abnormal screening mammograms

M. Mohamed Aly | Monday, March 11, 10:30 – 12:00 / Room F2

Purpose: To compare the diagnostic potential of digital mammography with tomosynthesis.
Methods and Materials: 100 women with abnormal screening mammograms,187 findings, and definite imaging or histopathological diagnosis were included. The screening mammography interpretation consisted of direct comparison of the tomosynthesis (DBT) examination with full field digital mammography (FFDM) images. The study radiologists subjectively rated the equivalence of the image quality of both the DBT and the FFDM examinations with no use of additional mammography, magnification views or comparison mammography. The next step was categorising the findings in both FFDM and DBT separately according to BIRADS classification and the statistical analysis evaluated the p values of DBT and FFDM as well as their sensitivities.
Results :All findings categorised as BIRADS 3 according to mammography showed reduction in number,particularly for masses, when examined with tomosynthesis. The image quality of tomosynthesis was subjectively rated as equivalent (53.5%) or superior (43.3%) to digital mammography in 96.8% of the total of findings; the test was highly significant (p <0.001). For masses, tomosynthesis image quality was rated as equivalent in 40.5% or superior in 58.1% of findings. Masses were 53 % of findings in which tomosynthesis had superior image quality. The FFDM Sensitivity was of 91.9 % compared with 95.2% for DBT.
Conclusion: The diagnostic potential of digital breast tomosynthesis is superior to that of full-field digital mammography by evaluating their image quality and their sensitivity. Based on a subjective analysis, DBT showed a significantly higher image quality compared with digital mammography in all finding types, especially in the characterisation of masses.

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