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What is digital breast tomosynthesis (DBT)?

Jennifer Rollenhagen, MD
Diagnostic Radiology
Digital breast tomosynthesis (DBT, or 3D mammography), works like a standard mammogram. In this video, radiologist Jennifer Rollenhagen, MD, of Mercy Health, explains how DBT provides greater accuracy, especially for those with dense breast tissue.

Trinity Health is a Catholic health care organization that acts in accordance with the Catholic tradition and does not condone or support all practices covered in this site. In case of emergency call 911. This site is educational and not a substitute for professional medical advice, always seek the advice of a qualified healthcare provider.
Jamie L. Caughran, MD
Surgery
Digital breast tomosynthesis (DBT) is also called 3D mammography. In this video, Jamie Caughran, MD, FACS, of Mercy Health, explains what happens during DBT and how it differs from a standard mammogram.

Trinity Health is a Catholic health care organization that acts in accordance with the Catholic tradition and does not condone or support all practices covered in this site. In case of emergency call 911. This site is educational and not a substitute for professional medical advice, always seek the advice of a qualified healthcare provider.
Breast tomosynthesis is the first and only 3D digital technology that enables radiologists to see your breast in greater detail than traditional mammography. Approved by the U.S. Food and Drug-Administration (FDA), breast tomosynthesis produces a 3D image of your breast tissue in one-millimeter slices, allowing radiologists to see “inside” the breast, minimizing or eliminating ambiguity caused by overlapping tissue, common in women with dense breasts. Among its many benefits, it offers a 35% increase in cancer detection rate.

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Anne C. Hoyt, MD
Diagnostic Radiology
Digital breast tomosynthesis (3D mammography), is a U.S. Food and Drug Administration (FDA)-approved procedure that is given just like a regular mammogram -- the difference is the number of images. When the breast is compressed,15 very low-dose exposures at different angles are obtained as the x-ray tube moves in a small arc over the top of the breast. This information is then fed to a computer where it’s processed and reconstructed into three-dimensional images.
The digital breast tomosynthesis (DBT) system employs a digital X-ray that records a series of low-dose, high-resolution images of the breast while traversing a small (15°) arc around the compressed breast. As the projection angle changes, images are recorded at slightly different depths and thicknesses, from one surface of the breast to the other.

The compression time of approximately four seconds needed for DBT is similar to that used for standard two-dimensional digital mammography. Following the procedure, reconstruction algorithms are used to create a 3-D rendering of the interior breast architecture.

This rendering is presented to the breast imager as a stack of images of the breast that, in total, represent the area from one skin surface to the other. Each DBT image can be magnified or manipulated to better reveal minute detail. These processes can reduce the superimposition of overlapping tissue shadows seen in two-dimensional mammograms, allowing more accurate interpretations of breast changes.

Among the greatest advantages of DBT for radiologists is that it offers images with a clarity and degree of detail substantial enough to reduce some of the false-positives and false-negatives associated with 2-D mammographic imaging. In small series studies, researchers have reported reducing the false-positive callback rate by as much as 30 to 40%.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.