Molecular Breast Imaging (MBI)-Guided Biopsy

This is a pilot single-group crossover screening clinical trial comparing screening MBI (molecular breast imaging) to screening DBT (3D mammography, digital breast tomosynthesis. Women who have recently completed their annual screening DBT will be assessed for breast density. If they have BI-RADS density C or D (dense breasts), they are eligible for this study. After consent, participants will receive a supplemental screening MBI (crossover from DBT). Both screenings will be read while blinded to knowledge of the other. After independent reporting, a Conciliation Conference will compare the two, and a consensus report will be prepared. If biopsy is required on the consensus basis of both image sets, then the participant will be randomly assigned to DBT-guided or MBI-guided biopsy. If only one modality has visible lesions that require biopsy, then that modality will be assigned. The primary outcome measure is Cancer Detection Rate. Secondary outcome measures include Biopsy Callback Rate, Concordance Rate between MBI biopsy sample images and pathology, Time Duration of Biopsy, and Accuracy of Lesion Targeting.