3D mammograms (tomosynthesis) explained

A “3D mammogram” — properly called tomosynthesis (or digital breast tomosynthesis, DBT) — is a newer form of mammography. Instead of a single flat picture, it builds a layered view of the breast.^[1]

How it differs from a standard mammogram

In a standard (2D) mammogram, the breast is captured as a single image, so overlapping tissue can hide — or mimic — an abnormality. A 3D mammogram takes multiple images from slightly different angles as the X-ray tube moves in an arc, then combines them, letting the radiologist scroll through the breast in thin “slices” — a bit like CT.^[1]

Where it can help

Large studies show 3D mammography can improve cancer detection and reduce unnecessary call-backs, by separating overlapping tissue.^[1] It’s particularly useful in dense breast tissue, where a standard mammogram is harder to read, and can help pinpoint the size and location of an abnormality. The radiation dose is within approved safe limits — some systems are very close to standard mammography.^[1]

What it’s like

For you, a 3D mammogram feels much like a standard one — the breast is positioned and briefly compressed, and the images are taken in moments. Whether 3D is used depends on the equipment at your clinic and your situation.^[2]

Frequently asked questions

Is a 3D mammogram better than a regular one?

It can improve detection and reduce call-backs, especially in dense breasts. Whether it’s used depends on your clinic’s equipment and your circumstances — your provider can advise.^[1]

Does a 3D mammogram feel different?

Not really — the experience is much like a standard mammogram, with the same brief compression.^[2]