The Compartments operator allows to set the structures hierarchy to be used to evaluate their levels of relationships. Several nested levels are possible as well as two or more compartments at the same hierarchical basis.

Settings for Compartments:

• Add the TAG of the structures of interest as a source entry.
  
• Use the input selection button to select a different operation from the preceding pipeline.
  
• Remove the selected TAG from the entry.
  
• Move the selected TAG up & down in the hierarchical levels.
  
• Move the selected TAG as a "child" of the “parent” above it and push it up or down in the hierarchy.
  
• Select the required amount of overlap.
  
• Partial Overlap: Check whether a "child" segment is partially covered by a "parent" structure. You can set the necessary amount of overlap with the slider or the text input.
• Full Overlap: Check whether a "child" structure is fully covered by a “Parent" volume.

The Partial Overlap defines the percentage of the subject structure volume that must be covered by the Reference volume to be considered as compartmentalized. If you choose 0%, it still checks whether there is at least 1 voxel of coverage.

The selected parent TAG, as well as the child TAG can label more objects. For any object in the Parent TAG, all the child objects are compared to it in order to establish their belonging.