Reporting in the Journal of the American Medical Association, researchers write that 3-D mammography, also known as tomosynthesis, detects more cancers than traditional digital mammography and reduces the number of women called back for additional testing and biopsies. But the technology is expensive, exposes women to extra radiation, and there’s no indication yet that it catches more dangerous cancers, or is saving more lives. Physicians Sarah Friedewald, an author of the study, and Laura Esserman discuss 3-D mammography and what women should know for their next visit to the doctor.