Understanding Task Aggregation for Generalizable Ultrasound Foundation Models

ArXi:2603.18123v1 Announce Type: cross Foundation models promise to unify multiple clinical tasks within a single framework, but recent ultrasound studies report that unified models can underperform task-specific baselines. We hypothesize that this degradation arises not from model capacity limitations, but from task aggregation strategies that ignore interactions between task heterogeneity and available