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Hi Jérôme I just wrote something to split 4D to 3D; run the attached script (cspm_im_4Dto3D, from SPM5 only) and it will prompt for a 4D file to split. You can also use it in batch mode with a couple more options (see help). The 3D files should be the same as in the 4D file, so I don't think you will loose anything by converting. Best wishes, Paul Jérôme Redouté wrote: > Dear SPMers, > My parameters estimation process is extremely slow. Could this > slowness be due to using a 4D-Niftii dataset? > In order to check that, I would like to convert my sw_xxxx.nii 4D > files into a set of 3D files. > My questions are: > -SPM has a function to convert 3D -> 4D , but is the reverse function > available? Where can I find such a converter? > -These images are preprocessed (realignment, normalisation, > smoothing), do I risk to lose these parameters by converting to 4D to 3D? > Thanks for your help > Jerome >