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In this case, this is just a warning that can be ignored.  NIfTI headers 
contain two affine transform matrices, but one of them can not deal so well 
with certain shears (because it encodes only orthogonal zooms and rigid 
transforms - ie 9, rather than 12 parameters).  SPM5 mostly ignores this 
second matrix (except for its use for the flow fields and imported images by 
the DARTEL toolbox).  The warning is simply telling you that SPM is only 
writing an approximate representation of this matrix.  The main matrix (which 
is used by SPM) is written as it should be.

Best regards,
-John


On Wednesday 18 June 2008 12:38, Di Paola Margherita wrote:
> Dear All,
> first of all  thank you for the help I already got.
>
> I have a question about Darte and VBM.
> After I  transform DARTEL to MNI, I smooth my images (mmwrc* files
> according to the MCLAREN's advice). But when I smooth my images I get this
> error:
>
> Running "Smooth"
> Warning: QFORM0 representation has been rounded.
>
> > In @nifti\private\encode_qform0 at 27
>
>   In nifti.subsasgn>fun at 109
>   In nifti.subsasgn at 20
>   In spm_create_vol>create_vol at 81
>   In spm_create_vol at 16
>   In spm_smooth at 110
>   In spm_config_smooth>smooth at 79
>   In spm_jobman>run_struct1 at 1585
>   In spm_jobman>run_struct1 at 1595
>   In spm_jobman>run_struct1 at 1595
>   In spm_jobman>run_struct at 1514
>
> .. (this warning is repeated for all the images I am smoothing)
>
> Warning: QFORM0 representation has been rounded.
>
> > In @nifti\private\encode_qform0 at 27
>
>   In nifti.subsasgn>fun at 109
>   In nifti.subsasgn at 20
>   In spm_create_vol>create_vol at 81
>   In spm_create_vol at 16
>   In spm_smooth at 110
>   In spm_config_smooth>smooth at 79
>   In spm_jobman>run_struct1 at 1585
>   In spm_jobman>run_struct1 at 1595
>   In spm_jobman>run_struct1 at 1595
>   In spm_jobman>run_struct at 1514
> --------------------------
> Done.
>
>
>
> Could anybody help me to understand what does it mean? ANd if I should do
> something? Thank you
>
> Margherita
>
>
>
> Margherita Di Paola Psy.S.
> Neuroimaging Laboratory
> Santa Lucia Foundation, IRCCS
> Via Ardeatina 306
> 00179 Rome (Italy)
> Tel.: 0039 - 06 5150 1215
> Fax.: 0039 - 06 5150 1213
> E-mail:[log in to unmask]
> Web:www.hsantalucia.it/neuroimmagini