Update 'README.md'

README.md

 > All annotations underwent clinical review on 10–20% of lesions per organ to ensure high-quality ground truth.
 
 
+## 📑 Metadata CSV Format
+
+Each lesion in the 3DLAND dataset is described in a structured CSV file that includes key metadata for localization and segmentation. This CSV file links the image slices with their corresponding organ labels and bounding boxes.
+
+### 📄 Sample Columns
+
+| Column         | Description                                                                 |
+|----------------|-----------------------------------------------------------------------------|
+| `series`       | Series ID from the DeepLesion dataset                                       |
+| `slice_range`  | Range of axial slices in which the lesion appears (e.g., `44~83`)           |
+| `key_slice`    | Central slice with the most visible view of the lesion                     |
+| `lesion_id`    | Unique ID assigned to each lesion                                           |
+| `matched_organs` | Organ to which the lesion is anatomically linked                          |
+| `File_name`    | PNG file name of the key slice (e.g., `000002_02_01_050.png`)               |
+| `Bounding_boxes` | Coordinates of the lesion in the key slice: `[x_min, y_min, x_max, y_max]` |
+
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 ## 📄 License
 
 The dataset and outputs are licensed under **CC BY 4.0**.