Abbreviations: DBT=digital breast tomosynthesis, UPenn=University of Pennsylvania, D-BWH =Dartmouth-Hitchcock health system and Brigham and Women’s Hospital, VT=University of Vermont
*UPenn imaging data includes imaging from 1/1/12 to 12/31/13. Follow-up imaging data were available through 6/30/14. The largest imaging site began exclusively using tomosynthesis on October 1, 2011, but data availablility began on January 1, 2012. Cancer data also included UPenn institutional cancer registry data through June 2014.