arXiv cs.LG
7/22/2026

FedCC: A Low-Resource Federated Adaptation of Foundation Models for Robust Corpus Callosum localization in Fetal Ultrasound Images
Short summary
FedCC is a federated learning framework for localizing the corpus callosum in fetal ultrasound images across multi-center, resource-constrained clinical settings without data sharing. It combines a frozen DINOv2 backbone with a lightweight YOLO detection head and LoRA modules, reducing trainable parameters from 24.4M to 2.9M (8.5x communication cost reduction). Evaluated on 10,970 frames from 58 pregnant women across three sites, the DINOv2+LoRA FedAvg configuration achieved 0.857 mAP@50 and 0.803 F1-score, outperforming full fine-tuning and encoder-freezing baselines.
- •Federated learning framework for fetal ultrasound corpus callosum localization without data sharing
- •Frozen DINOv2 + YOLO + LoRA reduces trainable params 8.5x to 2.9M while achieving 0.857 mAP@50
- •Validated on multi-center dataset of 10,970 frames from 58 patients across three clinical sites
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