Breast tomosynthesis, also called three-dimensional (3-D) mammography and digital breast tomosynthesis (DBT), is an advanced form of breast imaging where multiple images of the breast from different angles are captured and reconstructed (“synthesized”) into a three-dimensional image set. In this way, 3-D breast imaging is similar to computed tomography (CT) imaging in which a series of thin “slices” are assembled together to create a 3-D reconstruction of the body.
Although the radiation dose for some breast tomosynthesis systems is slightly higher than the dosage used in standard mammography, it remains within the FDA-approved safe levels for radiation from mammograms. Some systems have doses very similar to conventional mammography.
Large population studies have shown that screening with breast tomosynthesis results in improved breast cancer detection rates and fewer “call-backs,” instances where women are called back from screening for additional testing because of a potentially abnormal finding.
- earlier detection of small breast cancers that may be hidden on a conventional mammogram
- greater accuracy in pinpointing the size, shape and location of breast abnormalities
- fewer unnecessary biopsies or additional tests
- greater likelihood of detecting multiple breast tumors
- clearer images of abnormalities within dense breast tissue