Dear Andreas,
When you mentioned a bad z-shift do you think that the phase enconding
direction for these subjects could be different?
Thanks
ines
On Mon, Apr 20, 2015 at 5:14 PM, Li, Lucia M <[log in to unmask]> wrote:
> Dear Andreas,
> Thank you for replying.
> Yes, we use the BBR option in the registration step.
> Lucia
> ________________________________________
> From: FSL - FMRIB's Software Library [[log in to unmask]] on behalf of Andreas Bartsch [[log in to unmask]]
> Sent: Monday, April 20, 2015 4:36 PM
> To: [log in to unmask]
> Subject: Re: [FSL] B0 unwarping misalignment
>
> Hi,
>
> this looks like bad z-shift.
> Do you use FSL's latest version, i.e. BBR?
> Cheers,
> Andreas
>
> Am 20.04.15 15:31 schrieb "Lucia M Li" unter <[log in to unmask]>:
>
>>Dear FSL users & experts,
>>
>>We were hoping to get some help on an issue we've had with our unwarping
>>step (run as part of running a single-session melodic).
>>
>>We noticed that for a couple of people in our study, the "fieldmap to
>>highres" registration looks seriously displaced - see link:
>>https://dl.dropboxusercontent.com/u/22466029/FieldmapAlignment/Missalignme
>>nt.jpg
>>
>>The majority of our scans have registered very well however - see link:
>>https://dl.dropboxusercontent.com/u/22466029/FieldmapAlignment/GoodAlignme
>>nt.png
>>
>>We were wondering if anyone could advise on what might have caused this
>>displacement in a few people only (scanned using the same scanner/
>>parameters, fieldmaps prepared using the same parameters & unwarped with
>>the same parameters)?
>>We were also wondering what effect this has on the final data (the final
>>func to highres looks ok) and what we can do to correct it?
>>
>>Many thanks in advance for your help.
>>
>>Kind regards,
>>Lucia
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