Hi,
This is normal and doesn't represent any problem.
It is just a change made to make the treatment of Analyze
and nifti more consistent with respect to left-right ordering.
It does not, in any way, affect the processing within FSL.
See the item about left-right and negative pixdims in Analyze
on the FSL FAQ: http://www.fmrib.ox.ac.uk/fslfaq/#general_lr
All the best,
Mark
On 5 Jan 2007, at 16:59, Weiting Zhang wrote:
> Dear FSL developers,
>
> Most of my colleagues including me at MGH-NMR Center use FSL
> installed in a
> shared folder in our center. Recently I noticed a difference in the
> results
> from bet program before and after the latest upgrade on 6/28/06.
> Specifically, I run the same command line with the same SOURCE.img:
>
> bet SOURCE.img SOURCE_brain.img
>
> and look at the header info of SOURCE_brain.hdr (I've kept using
> ANALYZE
> format) with avwinfo. The result was like this BEFORE the upgrade:
>
> ...
> pixdim1 2.0000000000 % which is the same as that of
> SOURCE.img %
> ....
>
> and is like this AFTER the upgrade:
> ....
> pixdim1 -2.0000000000
> ....
>
> Unfortunately I couldn't find an older version of bet before 6/28/06
> therefore could not reproduce this problem with any new data but I
> do keep
> the results before upgrade. Any feedback would be highly appreciated.
>
> Thanks,
> Weiting
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