axis tilt angle missed when saving Nifti

It seems that if I keep saving files in nifti format (for example by 3dZeropad), the tilt angle of an oblique dataset is lost. (3dinfo says its orientation is plumb). I wonder if there is any way to add back the tilt angle? The loss of tilt angle seems to make the job more difficult for


Programs that alter the geometry lose the obliquity information because the original information is no longer accurate. Usually there is a way to do the alignment beforehand or to use the zeropadded output as a master.