In this section, you will learn how to visualize a CT scan along with its segmentation in 3D Slicer.

To visualize an image set, follow these steps:

1. Open the "DICOM" section in 3D Slicer.
2. Double-click on the patient folder you want to view.
   
3. Wait a few seconds for the images to load into the scene.

Once the data is loaded, four visualization windows will appear in the scene:

• 🟥 Red window: Axial view.

• 🟩 Green window: Coronal view.

• 🟨 Yellow window: Sagittal view.

• 🔵 Blue window: Segmentation representation based on RTSTRUCT.

   

Note: In some cases, the RTSTRUCT segmentation will appear centered in the blue window. However, in other cases, such as for patient LUNG1-001, the segmentation may appear shifted downward. If this happens, zoom out until the segmented region is visible.

There are two main ways to visualize images depending on the selected segmentation. By default, both are active, but you can choose which one to display:

1️⃣ Viewing RTSTRUCT

• To view only the RTSTRUCT segmentation, hide the SEG segmentation by clicking the eye icon 👁️.
  Visible
  Hidden
• In this mode, the blue window will show the segmented volume.
  

2️⃣ Viewing SEG

• To switch to the SEG segmentation, hide the RTSTRUCT segmentation and activate SEG by clicking the eye icon 👁️.
• In this case, the blue window will not display the segmented volume.
  

🚀 Now you know how to visualize and switch between segmentations in 3D Slicer.

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