Breast tomosynthesis, also known as 3D mammography, is a relatively new imaging technique used in breast cancer screening. It involves taking multiple low-dose X-ray images of the breast from different angles, which are then reconstructed into a 3D image. This allows radiologists to examine the breast tissue layer by layer, making it easier to detect small tumors and reduce false-positive results compared to traditional 2D mammography. Breast tomosynthesis has been shown to improve cancer detection rates and reduce the need for additional imaging and biopsies. It is considered a promising technology in the field of breast cancer screening and diagnosis.