Digital breast tomosynthesis: a comparison of the accuracy of digital breast tomosynthesis, two-dimensional digital mammography and two-dimensional screening mammography (film-screen)
© Michell et al; licensee BioMed Central Ltd. 2009
Published: 26 October 2009
Digital breast tomosynthesis (DBT) may improve the accuracy of mammography by enabling visual separation of overlapping tissues (Andersson et al. 2008, Poplack et al. 2007).
Following local research ethics approval, all women attending the assessment clinic for evaluation of a mammographic abnormality found on routine screening (film-screen) were invited to take part in the study subject to informed consent. Participants underwent bilateral two-view two-dimensional (2D) digital mammography and bilateral two-view DBT. Mammography scores using the RCR Breast Group classification were sequentially obtained for the screening mammogram, 2D digital and DBT, and these were each compared with the final assessment outcome.
2D digital mammogram
Assessment outcome = normal or benign (n = 238)
M1 or M2
Assessment outcome = malignant (n = 62)
Kappa coefficients for agreement of each imaging method with final assessment outcome were calculated. Screening mammograms had the lowest agreement with the final outcome (Kappa = 0.02; P = 0.22), 2D digital mammography was better (Kappa = 0.26; P = 0.0000) and DBT had the highest score (Kappa = 0.37; P = 0.0000).
The preliminary results of this ongoing study show that DBT increases the diagnostic confidence of the radiologist. This supports the need for a larger multicentre study.
This article is published under license to BioMed Central Ltd.