[ITK-users] meaning of negative spacing

[Zein Salah]

Hi,

I have a question regarding reading dicom files with itk,
particularly, multiframe dicom file (all slices in one single file).

I have read an image with itk 4.10 and write it into an mhd-raw image.
I noticed that the z-spacin is negative.
What does negative spacing mean?

thanks,
Zein