Documentation/4.5/FAQ/Segmentation

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Segmentation

How to switch between scalar/labelmap volume ?

Previously it was possible to switch between scalar/labelmap type by changing an attribute value. Now scalar/labelmap volumes are stored in different classes, therefore a new node has to be created for the converted volume. Conversion options:

  • Use the Cast Scalar Volume module to convert between scalar/labelmap volumes.
  • Create a new node for the target representation and pass the image data of the source node to the target node. For example, conversion to labelmap volume:
   scalarVolume = slicer.util.getNode('MRHead')
   labelVolume = slicer.modules.volumes.logic().CreateAndAddLabelVolume(scalarVolume,scalarVolume.GetName()+'-label')
   labelVolume.SetAndObserveImageData(scalarVolume.GetImageData())
   slicer.mrmlScene.RemoveNode(scalarVolume)