arXiv Computer Vision By Wenjie Xuan, Yapeng Li, Hang Su, Chen Cheng, Juhua Liu, Sheng Zhao, Ziming Huang, Bo Du

Pos4CHD: A Positive-Free Mask-Guided Counterfactual Synthesis Framework for Fetal Congenital Heart Defect Analysis

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Pos4CHD is a positive‑free, mask‑guided counterfactual synthesis framework designed to generate realistic fetal heart ultrasound images with congenital heart defects (CHDs) from only normal samples. It introduces FE‑Gen, a mask‑guided generative model that improves image‑mask alignment, and uses manipulated semantic masks to render anatomically consistent pseudo‑positive images. Experiments on in‑house datasets and expert evaluations show high visual fidelity (−12.97 FID) and anatomical consistency (+3.96% DSC), and the synthesized data boosts performance in zero‑shot classification, lesion detection, and anatomy segmentation tasks.

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