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