Hi,
We would not recommend running BET on individual diffusion-weighted images.
Instead, if you really need to mask your diffusion data yourself, you should run BET on a non-diffusion weighted image (a b=0 image) and save the brain mask. You can then apply this brain mask to the whole diffusion dataset (after appropriate eddy/motion correction) using fslmaths.
The same procedure can be used for the FA image.
All the best,
Mark
On 18 Jun 2014, at 04:02, SPM Sophia <[log in to unmask]> wrote:
> Dear all,
> I tried BET in FSL on 4D DWI image(256*256*19*21), but it just works on the first volume(B0:256*256*19).
> How can it work on all the volumes?
> And could I use BET on an FA image?
>
> Best,
> sophia
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