Breast Cancer Screening is done using mammogram, clinical breast exam (CBE), and MRI (magnetic resonance imaging) tests. MRI may be better than mammography and ultrasound at finding a small mass in a woman's breast, especially for women with very dense breast tissue. Digital mammography may be better able to screen breast cancers. A newer type of mammogram is called tomosynthesis or 3D mammography which may improve the ability to find small cancers and reduce the need to repeat tests due to false-positives.