Model Description
UniReason-Med is trained to interleave free-form reasoning with localized visual evidence. During reasoning, the model emits bounding boxes over the input image; the referenced region is cropped and re-injected as additional visual context for the next reasoning step. The same shared interface is applied to 2D images and to 3D volumes serialized as ordered slice sequences.
Training
The model is built with supervised fine-tuning followed by GRPO reinforcement learning. RL uses answer-correctness and format rewards rather than ground-truth localization-overlap rewards such as IoU or Dice.
Intended Use and Limitations
- Intended use: research on medical multimodal reasoning, visual grounding, and 2D-to-3D transfer.
- Out of scope: this is a research artifact and is not a medical device. It must not be used for clinical diagnosis, treatment decisions, or real patient care.
- Limitations: outputs may be incorrect, incomplete, or biased; predicted bounding boxes are reasoning aids, not validated localization.
License
Released under the Apache License 2.0, consistent with the base model Qwen2.5-VL-7B-Instruct.