arXiv — cs.AI preprintsInternational9 October 2026
Analyzing and Improving Fine-grained Preference Optimization in Medical LVLMs
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arXiv:2606.12590v2 Announce Type: replace-cross Abstract: Preference optimization is increasingly used to post-train medical large vision-language models (LVLMs), yet it operates at a much coarser granularity than the one that defines clinical correctness. Whether one response is clinically better than another usually comes down to a few decisive phrases, such as an anatomical laterality or a lesion attribute, and to whether each is supported by the image region the question concerns. Direct Preference Optimization (DPO) and its variants, by contrast, reduce the comparison to a single response
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