Inclusion Criteria:  female patients who undergoes DBT must have a compressed breast thickness of more than 2 cm,with small mass,age>35,not have mastitis,not proceed breast implant  Exclusion Criteria:  Female Patients with breast implant ,severe nipple discharge, large palpable mass, mastitis and women within reproductive age(15-35 ) Female patients with huge breast that may exceed the detector size requirements for global diagnostic DBT.