[vtkusers] image reader data spacing and IPW

[dean.inglis at on.aibn.com]

John,

can you post the code for the init of the reader and the init
of the widgets? Are you 100% sure of the FOV and slice thickness
of your axial images?  If you are reading from a stack of DICOM
images, the pixel spacing can be pulled from the files' DICOM header
to confirm that FOV/matrix size = (header reported) pixel spacing.
There is no restriction on number of slices in IPW and the input
spacing is always 'respected'...

Dean