VTK Medical3 example clipping planes are of the iso center of volume

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Hi,

I modified the Medical3 example of VTK and replace vtkVolumeReader16 with vtkDICOMImageReader and I run the Medical3 project and I see the volume perfectly!
My problem is that the three clipping blades in iso center of the volume is completely off the center! well in vtkVolumeReader16 we for of set the set some properties such as SetImageRange, SetDimensions, etc.
could that be the reason?
is there any way I could adjust the blades by renderer->Reset ?