+ for 'true' 3D image sets :
+ - if you want to get a single 3D vtkImageData, use SplitOnOrientation -i.e. no split-
+ - if you want to get a vector of 2D vtkImageData, use SplitOnPosition -i.e. one slice in each 'XCoherent filesite'-
+
+ for 'true' 4D multi-orientation image sets (i.e. a stack of axial + sagital + coronal images, at different instants ...)
+ --> this is 5D, right?
+ Nothing done, yet.
+
+