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.
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