Many thanks Bruce,
I will choose the best one in this case. 

The command line was: 
recon-all -s B_06 -qcache -measure thickness -all
(I already had copied by hand the /mri/orig/001.mgz and 002.mgz)

Just in case I repeated the process with the original files, but I had exactly 
the same results. This was the command line: 
recon-all -i /home/glerma/glerma/freesurfer/subjects/BERTSO_MRI/BS3_06/58153751 
-i 
/home/glerma/glerma/freesurfer/subjects/BERTSO_MRI/SESION2/06_BERTSOLARI_IEA/54336388
 -s B_06c -qcache -measure thickness -all


thanks!
Gari 


On 2012-08-10, at 19:05, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:

> what was your command line (now I sound like Doug)? Including structurals 
> from different days may not work as you may have large differential 
> distortions due to differences in e.g. shimming, gradient nonlinearities, 
> etc... that will preclude an accurate motion correction. Certainly it failed 
> in this case.
> 
> cheers
> Bruce
> 
> On Fri, 10 Aug 2012, Garikoitz Lerma Usabiaga wrote:
> 
>> Thanks for the answer Bruce,
>> it is still running, so I killed the process.
>> 
>> When using two individual structural images separately, the recon-all 
>> process was OK. When I tried to use both structurals, I can check that the 
>> T1.mgz has some strange distortions (please check image attached).
>> 
>> 
>> 
>> 
>> 
>> When it is ok using two structurals (different days, same subject)? In this 
>> is case, is there something we can do to fix it or should be use just one of 
>> them?
>> 
>> 
>> Many thanks,
>> Gari
>> 
>> 
>> 
>> On 2012-08-05, at 23:25, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:
>> 
>>> Hi Gari
>>> 
>>> is it still running? The time it takes is square in the convex hull of the 
>>> largest defect, so that can take a long time. A 45K defect is too big and 
>>> typically means something is dramatically wrong, like the cerebellum or 
>>> skull is attached.
>>> 
>>> cheers
>>> Bruce
>>> 
>>> 
>>> On Sun, 5 Aug 2012, Garikoitz Lerma Usabiaga wrote:
>>> 
>>>> Hi FS experts, I've run recon-all -i file -s subject -qcache -measure
>>>> thickness -all to:
>>>> - 18 subjects, session 1 T1
>>>> - same 18 subjects, session 2 T1
>>>> and everything went well.
>>>> Then I copied the <subject_id_session>/mri/orig/001.mgz-s to
>>>> <subject_id>/mri/orig/001.mgz and 002.mgz, and run the same command again:
>>>> recon-all -s <subject_id>  -qcache -measure thickness -all
>>>> Half of the subjects are failing when trying to correct the topology. 
>>>> Please
>>>> find below the outputs of two of the subjects.
>>>> Should I use the -i and the original files instead of the already created
>>>> 001.mgz files? What should I check in order to avoid this error or what
>>>> should I do in order to correct it?
>>>> thank you very much,
>>>> Gari
>>>> *************************************************************
>>>> INFO: assuming .mgz format
>>>> $Id: mris_fix_topology.c,v 1.44 2010/05/27 23:37:16 nicks Exp $
>>>>  $Id: mrisurf.c,v 1.678 2010/05/28 21:22:21 rpwang Exp $
>>>> before topology correction, eno=-956 (nv=167898, nf=337708, ne=506562,
>>>> g=479)
>>>> using quasi-homeomorphic spherical map to tessellate cortical surface...
>>>> Correction of the Topology
>>>> Finding true center and radius of Spherical Surface...done
>>>> Surface centered at (0,0,0) with radius 100.0 in 10 iterations
>>>> marking ambiguous vertices...
>>>> 127705 ambiguous faces found in tessellation
>>>> segmenting defects...
>>>> 125 defects found, arbitrating ambiguous regions...
>>>> analyzing neighboring defects...
>>>>      -merging segment 6 into 1
>>>>      -merging segment 9 into 1
>>>>      -merging segment 21 into 1
>>>>      -merging segment 24 into 1
>>>>      -merging segment 26 into 1
>>>>      -merging segment 29 into 1
>>>>      -merging segment 44 into 1
>>>>      -merging segment 56 into 1
>>>>      -merging segment 2 into 1
>>>>      -merging segment 65 into 1
>>>>      -merging segment 67 into 1
>>>>      -merging segment 71 into 1
>>>>      -merging segment 4 into 1
>>>>      -merging segment 12 into 1
>>>>      -merging segment 34 into 18
>>>>      -merging segment 30 into 19
>>>>      -merging segment 38 into 35
>>>>      -merging segment 61 into 47
>>>>      -merging segment 107 into 106
>>>>      -merging segment 115 into 113
>>>> 105 defects to be corrected
>>>> 0 vertices coincident
>>>> reading input surface
>>>> /home/BCBL/glerma/freesurfer/subjects/BERTSO/B_16/surf/lh.qsphere.nofix...
>>>> reading brain volume from brain...
>>>> reading wm segmentation from wm...
>>>> Computing Initial Surface Statistics
>>>>      -face       loglikelihood: -7.9838  (-3.9919)
>>>>      -vertex     loglikelihood: -5.7349  (-2.8674)
>>>>      -normal dot loglikelihood: -3.5106  (-3.5106)
>>>>      -quad curv  loglikelihood: -6.1770  (-3.0885)
>>>>      Total Loglikelihood : -23.4063
>>>> CORRECTING DEFECT 0 (vertices=23, convex hull=21)
>>>> After retessellation of defect 0, euler #=-32 (96640,274187,177515) :
>>>> difference with theory (-102) = -70
>>>> CORRECTING DEFECT 1 (vertices=44927, convex hull=14482)
>>>> Topology Correction Parametersretessellation mode:           genetic search
>>>> number of patches/generation : 10
>>>> number of generations :        10
>>>> surface mri loglikelihood coefficient :         1.0
>>>> volume mri loglikelihood coefficient :          10.0
>>>> normal dot loglikelihood coefficient :          1.0
>>>> quadratic curvature loglikelihood coefficient : 1.0
>>>> volume resolution :                             2
>>>> eliminate vertices during search :              1
>>>> initial patch selection :                       1
>>>> select all defect vertices :                    0
>>>> ordering dependant retessellation:              0
>>>> use precomputed edge table :                    0
>>>> smooth retessellated patch :                    2
>>>> match retessellated patch :                     1
>>>> verbose mode :                                  0
>>>> *************************************************************
>>>> INFO: assuming .mgz format
>>>> $Id: mris_fix_topology.c,v 1.44 2010/05/27 23:37:16 nicks Exp $
>>>>  $Id: mrisurf.c,v 1.678 2010/05/28 21:22:21 rpwang Exp $
>>>> before topology correction, eno=-600 (nv=159708, nf=320616, ne=480924,
>>>> g=301)
>>>> using quasi-homeomorphic spherical map to tessellate cortical surface...
>>>> Correction of the Topology
>>>> Finding true center and radius of Spherical Surface...done
>>>> Surface centered at (0,0,0) with radius 100.0 in 8 iterations
>>>> marking ambiguous vertices...
>>>> 115040 ambiguous faces found in tessellation
>>>> segmenting defects...
>>>> 96 defects found, arbitrating ambiguous regions...
>>>> analyzing neighboring defects...
>>>>      -merging segment 16 into 0
>>>>      -merging segment 39 into 0
>>>>      -merging segment 48 into 0
>>>>      -merging segment 22 into 21
>>>>      -merging segment 38 into 34
>>>>      -merging segment 42 into 37
>>>>      -merging segment 70 into 69
>>>> 89 defects to be corrected
>>>> 0 vertices coincident
>>>> reading input 
>>>> surface/home/BCBL/glerma/freesurfer/subjects/BERTSO/B_11b/surf/lh.qsphere.nofix...
>>>> reading brain volume from brain...
>>>> reading wm segmentation from wm...
>>>> Computing Initial Surface Statistics
>>>>      -face       loglikelihood: -7.9998  (-3.9999)
>>>>      -vertex     loglikelihood: -5.5541  (-2.7771)
>>>>      -normal dot loglikelihood: -3.5423  (-3.5423)
>>>>      -quad curv  loglikelihood: -6.1041  (-3.0520)
>>>>      Total Loglikelihood : -23.2003
>>>> CORRECTING DEFECT 0 (vertices=41794, convex hull=12626)
>>>> 
>>> 
>>> 
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