  Purpose: To develop a Breast Imaging Reporting and Data System (BI-RADS)
breast density deep learning (DL) model in a multi-site setting for synthetic
two-dimensional mammography (SM) images derived from digital breast
tomosynthesis exams using full-field digital mammography (FFDM) images and
limited SM data.
  Materials and Methods: A DL model was trained to predict BI-RADS breast
density using FFDM images acquired from 2008 to 2017 (Site 1: 57492 patients,
187627 exams, 750752 images) for this retrospective study. The FFDM model was
evaluated using SM datasets from two institutions (Site 1: 3842 patients, 3866
exams, 14472 images, acquired from 2016 to 2017; Site 2: 7557 patients, 16283
exams, 63973 images, 2015 to 2019). Each of the three datasets were then split
into training, validation, and test datasets. Adaptation methods were
investigated to improve performance on the SM datasets and the effect of
dataset size on each adaptation method is considered. Statistical significance
was assessed using confidence intervals (CI), estimated by bootstrapping.
  Results: Without adaptation, the model demonstrated substantial agreement
with the original reporting radiologists for all three datasets (Site 1 FFDM:
linearly-weighted $\kappa_w$ = 0.75 [95% CI: 0.74, 0.76]; Site 1 SM: $\kappa_w$
= 0.71 [95% CI: 0.64, 0.78]; Site 2 SM: $\kappa_w$ = 0.72 [95% CI: 0.70,
0.75]). With adaptation, performance improved for Site 2 (Site 1: $\kappa_w$ =
0.72 [95% CI: 0.66, 0.79], 0.71 vs 0.72, P = .80; Site 2: $\kappa_w$ = 0.79
[95% CI: 0.76, 0.81], 0.72 vs 0.79, P $<$ .001) using only 500 SM images from
that site.
  Conclusion: A BI-RADS breast density DL model demonstrated strong performance
on FFDM and SM images from two institutions without training on SM images and
improved using few SM images.
