Hi Michel,
as a little addendum to Saads reply I should stress that topup can only be used if the data was acquired in a way that allows it. I.e. if data was for example acquired twice with opposing phase-encode blips. Data that was acquired without planning to use topup is unlikely to be possible to process with topup.
This is equivalent to other types of distortion correction where if for example one has not acquired fieldmaps one cannot use fieldmap based corrections.
Good luck Jesper
On 26 Sep 2012, at 09:49, Michel Thiebaut de Schotten wrote:
> Dear experts,
>
> This morning I tried to run topup for the first time, to correct distortion on a DWI dataset.
> Following the help menu I wrote the following command
>
> topup --imain=DWI.nii --datain=bvecs
>
> But the following error occurred:
> TopupFileIO:: msg=TopupDatafileReader:: error reading file bvecs
> What is supposed to be the --datain if not the Bvec?
>
> Thanks for your help an the new release of FSL,
> Kind regards,
>
> Michel
>
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