[vtkusers] Accessing pixelvalues in vtkImageData

[Prename Surname]

 Hello. How can i get a set of pixels from a volume that represents all
values in that volume?
Meaning i have a volume with 182x218x182 pixels. All of these pixels have
different or same values.
I want a set of all unique voxels in the volume. How can i do that?

If i were just able to access the pixelvalues i could make a function
myself. But i cannot figure out how to access the pixelvalues in vtk. I hope
someone can help

Many regards
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