Hi,
I am having some troubles during my realign & unwarp computation.
I am using matlab 7.6.0 with spm8b (last update). I got 6 runs of images
convert from dcm to nii with dcm2nii (visually everything looks ok).
I tried the realign & unwarp on my data with .nii extension (4D) and
img/hdr extension (3D and 4D).
During the process (estimation) I got several of these :
Warning: Matrix is singular, close to singular or badly scaled.
Results may be inaccurate. RCOND = NaN.
In spm_uw_estimate>make_q at 484
In spm_uw_estimate>make_ref at 766
In spm_uw_estimate at 370
In spm_run_realignunwarp at 89
In matlabbatch/private/cfg_run_cm at 29
In cfg_util>local_runcj at 1345
In cfg_util at 686
In cfg_ui>MenuFileRun_Callback at 1129
In gui_mainfcn at 96
In cfg_ui at 53
procedure terminated abnormally:
Error using ==> schur
Input to SCHUR must not contain NaN or Inf.
#And finally I got this error message, I guess it is during the writing....
Failed 'Realign & Unwarp'
Reference to non-existent field 'beta'.
In file "/usr/local/etc/Matlab/toolbox/spm8b/spm_uw_apply.m" (v1358),
function "spm_uw_apply" at line 226.
In file "/usr/local/etc/Matlab/toolbox/spm8b/config/spm_run_realignunwarp.m"
(v2337), function "spm_run_realignunwarp" at line 106.
It seems that during the estimation the field beta is not computed for some
of my runs. Is it aborded because of the warning?
To check I tried to realize an estimate & reslice (without fieldmap
correction), everything is running well.
I saw an email sent by Adam Jacks (in spm5) earlier this month with the same
kind of problem.... but no solution seems to be done.
Thanks
Cécile
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