FADA: Unified vision-language model for fetal ultrasound interpretation deployable on consumer smartphones
FADA is a unified vision-language model built on Qwen3.5-VL that performs clinical interpretation, classification, detection, and segmentation of fetal ultrasound images through a single pipeline without requiring external labels at inference. The system distills knowledge from four domain-specific foundation models using selective distillation, achieving 0.8820 mean Dice for segmentation and 0.7671 mAP@0.50 for detection, with expert validation confirming clinically acceptable outputs. Notably, the compressed 0.8B model runs entirely offline on a commodity smartphone (Qualcomm Snapdragon 7 Gen 1) in approximately 60 seconds, targeting diagnostic access gaps in low- and middle-income countries where trained sonographers are scarce. Code, models, and data are publicly released.
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