# Brain MRI Used Data: Gaussian vs SD DPO

This folder contains only the data used in the final matched DPO comparison and
the held-out Figshare segmentation evaluation.

## Training data

- `train/images`: 15,320 positive tumor MRI images.
- `train/masks`: unique lesion masks referenced by the training rows.
- `train/negative_images/gaussian`: tumor-region Gaussian-noise negatives.
- `train/negative_images/sd`: SD-generated negative images.
- `train/csv/dpo_train_gaussian_15320.csv`: Gaussian-negative DPO manifest.
- `train/csv/dpo_train_sd_15320.csv`: SD-negative DPO manifest.

The two CSV manifests contain the same image, mask, and caption rows. Only the
negative image source differs.

## Test data

- `test/figshare_v2/images`: 600 held-out images.
- `test/figshare_v2/masks`: 600 held-out ground-truth masks.

## Caption templates

- `metadata/base_caption_templates_100.json` and `.csv`: the 100 base anatomical caption templates, where `[A]` is replaced by the modality.
- `metadata/negative_caption_templates_100.json` and `.csv`: the 100 negative caption sentence templates.
- `metadata/caption_construction.json`: the positive and negative caption assembly rules, including `[B]` tumor-type insertion.

## Path policy

CSV paths are repository-relative and begin with `Brain_MRI_Used_Data_SD/`.
No server-specific home directory is stored in these manifests.