Update 'README.md'

README.md

@@ -100,6 +100,17 @@ You can use the metadata CSV to:
 - `3DLAND_Info.csv`
 
 
+---
+
+## 📥 Downloading CT Scans
+
+The original CT scan volumes used in 3DLAND are sourced from the **DeepLesion** dataset.
+
+You can download the CT scans from the official NIH repository:
+
+👉 [Download CT scans from DeepLesion (NIH)](https://nihcc.app.box.com/v/DeepLesion/folder/51877983116)
+
+> ℹ️ These CT volumes are required to visualize the lesion masks or to apply the 3DLAND segmentation pipeline. Make sure to match each `series` in the metadata with the corresponding CT study.
 
 
 ## 📄 License