Dear Cristophe,
the likely cause is that you have an odd number of voxels in one direction (typically z), which means that the subsampling (by a factor of two) indicated by the configuration file doesn’t work.
You can either edit the config file to do away with the subsampling (which will mean longer execution time) or you can remove the top or bottom slice if the FOV is such that you have some “air” at the top or bottom of the brain.
J
On 16 Sep 2015, at 14:15, Christophe Maggia <[log in to unmask]> wrote:
> Hi everyone
>
> I use topup to estimate fieldmap for DTI images
>
> i get :
> Topup: msg=topup_cpl::topup_cpl: Subsampling levels incompatible with image data
>
> The resolution of my images is 2.5x2.5x2.5mm, is it the cause ?
>
>
> Thanks in advance
>
> Christophe
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