In summary, mammography works. Even with traditional 2D mammograms as early as 2001, it showed that prompt annual mammography has the ability to reduce breast cancer deaths by almost 50%. 2D mammography is the older technology. It takes only two images – one from top and the other from the side of the breast. It may miss overlapping tumors between the tissues, if any.
3D mammography exam is the latest technology. It takes many images from different angles, and provides clearer, more detailed pictures.