arXiv AI By Runze Ma, Shunbo Jia, Haonan Lyu, Guo Liu, Caizhi Liao

LiteMedCoT-VL: Parameter-Efficient Adaptation for Medical Visual Question Answering

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LiteMedCoT-VL is a parameter‑efficient pipeline that transfers chain‑of‑thought reasoning from a 235B teacher model to a 2B student model using LoRA fine‑tuning on explanation‑enriched data. The approach enables a compact vision‑language model to perform medical visual question answering without relying on image captions, achieving 64.9% accuracy on the PMC‑VQA benchmark—an 11‑point improvement over the zero‑shot Qwen3‑VL‑4B baseline. Visual grounding analysis confirms that the model bases its predictions on image content rather than textual priors.

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