3D mammography is an FDA-approved advanced technology that takes multiple x-rays of breast tissue to recreate a 3D picture of the breast. It is also called breast tomosynthesis. Very low x-ray energy is used with 3D mammography, so your radiation exposure is very low. The multiple images from 3D mammography give doctors a clearer image of breast tissue and make it easier to detect breast cancer. Women with dense breast tissue in particular may benefit because from the clearer picture provided by this technology.