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Is it possible that there are 2500-3200 2D slices (each in a separate file), which get concatenated to give 84 3D volumes? The warning is there because the DICOM headers do not seem to contain all the information needed to put the slices of data together in an unambiguous way. The suggested fix would be to buy a scanner from a different manufacturer (or maybe ask your local MR pulse-sequence programmers about it). Hopefully, the heuristic approach used by the DICOM conversion in SPM will work in most cases, but I can't necessarily guarantee this. Best regards, -John On 6 May 2011 05:46, Kavita Vemuri <[log in to unmask]> wrote: > Hi, > I am using SPM8 for fMRI. For each session of the experiment, there > are around 2500-3200 images. When I use the DICOM to nii converter > provided in SPM8, I notice that only 84 nii format data is generated. > On the matlab console, I see a message that says something like > -acquisition number not changing or DICOM images are repeated'. > Is there something wrong in the way I am converting? > > regards Kavita > > > >