Breast tomosynthesis takes several X-rays, which are put together to form a 3-D image of the breast.
The actual procedure is not much different from a traditional mammogram. In fact, we use similar equipment, and it requires the same breast compression. The difference is in how we take the X-rays. During compression, a camera moves over the breast and takes multiple very low-dose images. The camera then comes back to the midline of the breast and takes a regular mammogram image. The compression is then released. The entire process takes about seven seconds per compression, only slightly longer than before.