Figure 2
From: Decreased 3D observer variation with matched CT-MRI, for target delineation in Nasopharynx cancer
![Figure 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1748-717X-5-21/MediaObjects/13014_2009_Article_227_Fig2_HTML.jpg)
Local delineation variation (SD) for one patient in 3D for CTV-Elective delineation Phase 1 (Left) and 2 (Right). Note the tail-like variation on the caudal side in the Phase 1 delineation.