 Screening to determine eligibility for enrollment will be open to women of all races and ethnicities who are asymptomatic for breast cancer and scheduled for routine screening mammography at the study site. Women younger than 25 years of age will not be eligible to participate. Potential participants must not be breastfeeding or pregnant at the time of screening and must not plan on becoming pregnant during the 12 month interval following anticipated enrollment. Patients who have had breast surgeries or interventional breast procedures in the past 12 months will also not be eligible to enter screening. Eligible women who have breast implants will be allowed to participate. 