It was probably the initialization that failed. To test this, run fslregister (very similar command line to bbregister). If that does not look good, then it is an init problem. If these were acquired in the same session, then you can try using --init-header. If you have spm installed, you can try --init-spm. The spm solution requires that SPM be set up properly for this program, which is not always so easy. It also requires matlab.
doug
francesca strappini wrote:
Thanks a lot! I tried the registration with bbregister but unfortunately when I checked the result the functional volume was very distant from the target. Could I tried something else to improve the registration?
I typed:
bbregister --s subject --mov name_file.nii --reg register.dat --init-fsl --bold
Thanks again!
Francesca