There are a number of tests that shows how IndependentComponents=false can be used. If you create a small standalone example then it would be great if you could contribute to the VTK examples site.
Since you work with CT images, it could make sense to use VTK in Slicer’s Python environment, because then you can get nice volume rendering using a few lines of Python code and/or set it up or adjust parameters using interactive GUI (if you need help using Slicer then post on the Slicer forum).