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Select / Extract sub-image

To select sub-image use two tools:
  • Z - Set Slices Range Tool (double slider under 2D view)
  • X and Y - Rectangular Selection Tool (2D view's lower panel [1])

[1] Rectangular Selection Tool is active in 2D main view (slices view) in default mouse mode.

Medical Imaging

Extract image   Filters->Extract selection
Apply as mask    Mask->Selection to mask and apply
Create mask   Mask->Selection to mask