Update 'README.md'

README.md

@@ -64,6 +64,42 @@ Each lesion in the 3DLAND dataset is described in a structured CSV file that inc
 
 
 
+## 📁 Folder Structure for Masks
+
+### 📌 Phase II
+- **Location:** `Phase II/2D_lesion_mask`
+- **Content:** 2D lesion masks for the **key slice**
+- **File Naming:** `{series}_{key_slice}.png`
+
+### 📌 Phase III
+- **Location:** `Phase III/3D_lesion_mask`
+- **Content:** 3D volumetric lesion masks covering the **entire slice range**
+- **File Naming:** `{series}_K{key_slice}/{slice number}.png`
+
+---
+
+## ⚠️ Notes on 3D Masks
+- The 3D masks in Phase III cover the **full slice range**, but:
+  - **Only a few slices near the key slice** contain non-zero segmentation.
+  - Slices **far from the key slice** are fully black (all-zero).
+- 💡 This design saves space while retaining anatomically relevant data since **abdominal lesions are usually thin** in the axial plane.
+
+---
+
+## 📌 Usage Tips
+You can use the metadata CSV to:
+
+- 🔍 Locate and crop lesions from the key slice for **training or inference**
+- 🧠 Generate **bounding box** or **center point** prompts for segmentation models
+- 🧬 Match each lesion to its organ for **multi-organ anomaly analysis**
+- 🖼️ Load and visualize corresponding **2D or 3D masks**
+
+---
+
+## 📂 Metadata File Location
+- `3DLAND_Info.csv`
+
+
 
 
 ## 📄 License