Find islands in a certain voxel size range.

FindIslandsInSizeRange.py

original_Segment_Name = 'Segment_Name_Here'
low_island_size = 20
high_island_size = 200

#
# Switch to segment editor and pick logical effects, and get the segment to work on.
#
slicer.util.selectModule('SegmentEditor')
segmentEditorWidget = slicer.modules.segmenteditor.widgetRepresentation().self().editor
segmentEditorWidget.setActiveEffectByName("Logical operators")
effect = segmentEditorWidget.activeEffect()
segmentationNode = getNode('Segmentation')
segmentation = segmentationNode.GetSegmentation()
air_segment_id = segmentation.GetSegmentIdBySegmentName(original_Segment_Name)

#
# Make a low to max by coping original and removing islands smaller than low.
#
segmentation = getNode('Segmentation').GetSegmentation()
low_to_max_segment_id = segmentation.AddEmptySegment()
segmentEditorWidget.setCurrentSegmentID(low_to_max_segment_id)
effect.setParameter("Operation", "COPY")
effect.setParameter("ModifierSegmentID", air_segment_id)
effect.self().onApply()
segmentEditorWidget.setActiveEffectByName('Islands')
effect = segmentEditorWidget.activeEffect()
effect.setParameter('Operation','REMOVE_SMALL_ISLANDS')
effect.setParameter('MinimumSize', low_island_size)
effect.self().onApply()

#
# Make a high to max in the same fashion.
#
high_to_max_segment_id = segmentation.AddEmptySegment()
segmentEditorWidget.setCurrentSegmentID(high_to_max_segment_id)
segmentEditorWidget.setActiveEffectByName('Logical operators')
effect = segmentEditorWidget.activeEffect()
effect.setParameter("Operation", "COPY")
effect.setParameter("ModifierSegmentID", air_segment_id)
effect.self().onApply()
segmentEditorWidget.setActiveEffectByName('Islands')
effect = segmentEditorWidget.activeEffect()
effect.setParameter('Operation','REMOVE_SMALL_ISLANDS')
effect.setParameter('MinimumSize', high_island_size)
effect.self().onApply()

#
# Finally, make a low to high segment bu subtracting high to max from low to max.
#
low_to_high_segment_id = segmentation.AddEmptySegment()
segmentEditorWidget.setCurrentSegmentID(low_to_high_segment_id)
segmentEditorWidget.setActiveEffectByName('Logical operators')
effect = segmentEditorWidget.activeEffect()
effect.setParameter("Operation", "COPY")
effect.setParameter("ModifierSegmentID", low_to_max_segment_id)
effect.self().onApply()
effect.setParameter("Operation", "SUBTRACT")
effect.setParameter("ModifierSegmentID", high_to_max_segment_id) 
effect.self().onApply()