Update README.md

README.md

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     num_examples: 4320
   - name: val
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     num_examples: 540
   - name: test
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     path: data/val-*
   - split: test
     path: data/test-*
+license: cc-by-nc-4.0
+task_categories:
+- text-generation
+language:
+- vi
 ---
+
+# ViX-Ray: A Vietnamese Chest X-Ray Dataset for Vision-Language Models
+
+ViX-Ray is the **first publicly available Vietnamese chest X-ray dataset** designed for vision-language model (VLM) research in medical AI. It pairs radiographic images from Vietnamese patients with expert-written clinical annotations in Vietnamese, directly addressing the lack of Vietnamese medical data in existing VLMs.
+
+- **License**: CC BY-NC-SA 4.0
+- **Paper**: [arXiv:2603.15513](https://arxiv.org/abs/2603.15513)
+
+---
+
+## Dataset Overview
+
+Each sample contains a PA-view chest X-ray image paired with Vietnamese-language radiology reports written by certified radiologists. All Protected Health Information (PHI) has been removed; clinically relevant metadata (age, gender) is retained. The dataset was collected under Institutional Review Board (IRB) approval.
+
+### Splits
+
+| Split | Samples | Percentage |
+|-------|---------|------------|
+| Train | 4,320   | 80%        |
+| Val   | 540     | 10%        |
+| Test  | 540     | 10%        |
+| **Total** | **5,400** | 100% |
+
+### Fields
+
+| Field | Description |
+|-------|-------------|
+| `image` | PA-view chest X-ray image |
+| `findings` | Detailed descriptive narrative of anatomical/pathological observations (Vietnamese) |
+| `impressions` | Clinical diagnostic conclusions (Vietnamese) |
+| `Ages` | Patient age in years |
+| `sex` | Patient gender |
+| `view` | Imaging perspective (PA — Posterior Anterior) |
+| `Ghi chú` | Procedure description (Vietnamese) |
+| `Kỹ thuật` | Technical details of the radiograph |
+
+### Report Text Length (tokens)
+
+| Split | Findings (avg) | Impressions (avg) |
+|-------|---------------|-------------------|
+| Train | 46            | 12                |
+| Val   | 45            | 14                |
+| Test  | 46            | 13                |
+
+Average patient age: ~69–70 years across all splits.
+
+---
+
+## Common Findings
+
+**Most frequently mentioned anatomical structures**: Heart (tim), Lungs (phổi), Ribs (xương sườn), Diaphragm (vòm hoành), Pulmonary hilum (rốn phổi)
+
+**Most common diagnoses**: Interstitial lung disease, Cardiomegaly, Pulmonary infiltrates/consolidations, Rib fractures, Aortic calcifications
+
+---
+
+## Intended Use
+
+- Training and fine-tuning vision-language models for Vietnamese medical image analysis
+- Benchmarking multilingual and Vietnamese-specific VLMs
+- Research on hallucination reduction in clinical AI
+- Multi-turn clinical diagnostic conversation modeling
+
+---
+
+## Benchmark Results
+
+Five open-source VLMs were fine-tuned and evaluated on three stages: findings generation → impression generation → multi-turn clinical dialogue. Best performing model: **Qwen2.5-VL-7B** (ROUGE-1: 84.30% on findings, 95.20% on multi-turn impressions).
+
+---
+
+## Citation
+
+If you use this dataset, please cite:
+
+```bibtex
+@article{nguyen2026vix,
+  title={ViX-Ray: A Vietnamese Chest X-Ray Dataset for Vision-Language Models},
+  author={Nguyen, Duy Vu Minh and Truong, Chinh Thanh and Tran, Phuc Hoang and Le, Hung Tuan and Dat, Nguyen Van-Thanh and Pham, Trung Hieu and Van Nguyen, Kiet},
+  journal={arXiv preprint arXiv:2603.15513},
+  year={2026}
+}
+```