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It is actually a 5D volume. The 4th dimension is set to 1, but the 5th dimension is 3. You may be able to see the other two volumes in the file by using the Edit button when you select the file, and changing the name from y_filename.nii,1 to y_filename.nii,1,2 or y_filename.nii,1,3 Best regards, -John On Monday 15 September 2008 17:36, Deny Menghini wrote: > Dear SPM community, > > We used the deformation field utility in SPM5 to create for each subject > the deformation field - we imported the sn.mat file for each subject > - we saved it, obtaining the file: y_filename.nii. > > We would have to obtain either a single 4D volume (y_filename.nii) or 3D > volumes. Instead the y_filename.nii we obtained is a single 3D volume for > each subject. > > > We would like to know: > 1) if we missed some steps. > 2) if not in which way we could use the single volume to reconstruct the > deformation field? > > Thank you in advance > > Deny Menghini