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The NIfTI headers contain a bunch of fields that are not fully supported within SPM5. SPM can read the fields, but does not write them (or sticks in default values). After we have made the full switch from the spm_vol utilities, and move to the nifti utilities, then we can start to deal with all fields. Because SPM currently involves over 300,000 lines of code, then changing everything over can take a while. Best regards, -John On Tuesday 08 July 2008 10:08, Dr. Karsten Mueller wrote: > Dear Colleagues, > > we are using Realign and Unwarp (spm_realign.m, spm_uw_estimate.m, and > spm_uw_apply.m) with 4D-NIfTI data which gives very nice results. > > However, these m-routines seem to change the NIfTI-header. Before > starting the realignment, our header shows > > time_units ms > pixdim4 2000.0000000000 > > which is correct. After using realign and unwarp, the NIfTI header shows > > time_units s > pixdim4 1.0000000000 > > This might be a problem when further programs are using the repetition > time from the NIfTI header. > > With best wishes, > Karsten