[vtkusers] vtkDICOMImageReader: No Image Orientation (patient) information

[John Biddiscombe]

Because in your average dicom file the "SliceThickness" tag, is not the same as the "Spacing between Slices" - so if multiple slices are present, use the actual distance between the Pixel corners of each slice as reported by ImagePositionPatient, if only one slice, then use the reported slicethickness.

JB

  Also, when reading a stack of slices, GetPixelSpacing() does like this: 

  if (sortedFiles.size() > 1)
      {
      vtkstd::pair<float, vtkstd::string> p1 = sortedFiles[0];
      vtkstd::pair<float, vtkstd::string> p2 = sortedFiles[1];
      this->DataSpacing[2] = fabs(p1.first - p2.first);
      }
    else
      {
      this->DataSpacing[2] = spacing[2];
      }  

  Why?


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