When there is no visible intensity difference at segment boundary then we recommend slice interpolation:
- use paint/draw effect on parallel slices - you can skip as many slices in between as you want (if the contour is not changing too quickly between slices then it may be enough to draw on every 5th or 10th slice)
- create full segmentation using “Fill between slices” effect.
In general, Slicer’s Segment Editor module is quite new, so it may not be as polished as ITK-snap, OsiriX, or Mimics; but it has several unique features and several very powerful effects that probably puts it ahead of all similar software. If you don’t find any feature in Slicer that are available in other software, then let us know and we can help finding it or implement in Slicer as well.