[Dcmlib] GDCM gets wrong spacing between two slices in z-direction?

[derong]

Hello,
 
I just tried vtkgdcmviewer to read series dicom files, and find it doesn't
know the spacing between two slices.
I guess It is always 1.0.
 
If i use pattern to read series files, can vtkgdcmReader get correct spacing
between two slices? maybe there is some tolerance issue that make the
spacing between two slices not always same.
 
Does DICOMDIR give us some helpful assistance to read series slices image to
make vtkImageData?
 
Any hints will be helpful!
 
Dennis Hu
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