Hi - please see the FAQ:
http://www.fmrib.ox.ac.uk/fslfaq/#general_ram
Cheers.
On 9 Oct 2007, at 16:45, Yujin Zhang wrote:
> Dear Sir :
> I`m working on the DTI data ( 52 subjects ) with FSL-TBSS .It is
> working well untill running the order "tbss_4_prestats 2000" .It
> created skeleton mask using threshold 2000 and the skeleton
> distance map and they looked well ,but it cannot create the
> all_FA_skeletonised file .It said :
>
> projecting all FA data onto skeleton
> terminate called after throwing an instance of 'std::bad_alloc'
> what(): St9bad_alloc
> /usr/local/fsl/bin/tbss_4_prestats: line 99: 11050
> Aborted ${FSLDIR}/bin/tbss_skeleton -i mean_FA -p
> $thresh mean_FA_skeleton_mask_dst ${FSLDIR}/data/standard/
> LowerCingulum_1mm all_FA all_FA_skeletonised
>
> I repeat it 3 times at different computers ,there is not improved .
> when I reduce the number of subjects to 47 ,it works very well and
> the all_FA_skeletonised created .Then I try 5, 10, 26 subjects
> separately ,it works well ,too .
>
> Why ? Is there the max number of subjects for tbss_4_prestats to
> project all FA data onto skeleton ?Can I project two groups
> subjects (each group has 26 subjects ) FA data onto skeleton
> separately , and merge them to be all_FA_skeletonised ?
> There ,skeleton is the skeleton of the mean of all FA data .
> 5 subjects failed to be normalized when I normalize all FA data
> using FMRIB58_FA standard space image ,but when I repeated this
> step with the 5 subjects alone, it succeeded, Do this 5 subjects
> have some effect to the projection ?
>
> Thank you for your reply !
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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