[Anonymous]

Hi Joaquin, Defining a brain mask for diffusion data, using –dwi-mask, can substantially improve the correction. can you show some images (screenshots) which shows inadequate correction?

[jottino]

Hi!

I’m starting with BS too because of the possibility of correcting EPI distortions with T1-weighted images.

I used both the –dwi-mask and –t1-mask in order to improve the correction following your advice, but the outcome was pretty the same. In fact, the outcome was even worse when I used one (–dwi-mask) or both masks (dwi+t1) than when I did not use any of them.

Maybe without a fieldmap and only a T1 little correction could be made? Don’t get me wrong, I’m quite glad with correcting at least a little of such distortions than leave my DWI volumes with such disturbances.

Regards,
Jonatan

[divarada]

Can you check if the phase encode direction (–dir) that you gave as input is correct ?

[Author]

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