 The clinical trial, begun in December, 2004, is being conducted at Emory University. Over the next three years, we will enroll and image about 2000 women who are at elevated risk for development of breast cancer personal or family history of breast cancer as they come in for their annual screening examinations. Each participating patient will be imaged with both systems, and the stereo and standard non-stereo images will be read independently by different mammographers. 