> Hi Davide, > Are these two voxels (x=31 and x=53) symmetrical with respect to the centre of the volume? > If that is the case, then it may have to do with neuro/radio conventions... Also, do you specify coords in mm or voxels? >
> Can you upload your data onto our server, i have not been able to reproduce that behaviour over here.. >
> Cheers, > Saad. >
>
> On 30 Oct 2009, at 13:40, Davide Imperati wrote: > > Dear all,
> I noted that probtrack ver 4.1.4, started form the fsl GUI, with single coordinates, saves the resulting tractogram using a confusing name.
> e.g. seed defined in img. space= 31,13,33
> Tractogram saved as <base>_53_13_33.
> The tractogram is computed correctly and the peak intensity (in this case 5000) is at 31,13,33.
> I was wondering why it happens and if it has any effect on the computation of the tractograms and their processing.
> (besides I have to understand the naming for scripting of the post-processing)
>
> Best Regards.
> Davide.
>
>
> ----- Original Message -----
> From: Stephen Smith <[log in to unmask])">[log in to unmask]>
> Date: Friday, October 23, 2009 9:53
> Subject: Re: [FSL] tbss - 1 voxel survived correction?
> To: [log in to unmask])">[log in to unmask]
>
> > Hi - because spatial extent has already been used in your test statistic (TFCE-enhanced tstat image), so local neighbourhood information has already fed into this single voxel's TFCE value. Cheers. > >
> > > > On 22 Oct 2009, at 15:31, Jiansong Xu wrote: > > > > Hi, Friends:
> > I did TBSS analysis and used following command to look at significant clusters. > >
> > cluster --in=tbss_tfce_corrp_tstat1 --thresh=0.95 --mm --cope=tbss_tstat1 > >
> > I was surprised to find that among the outputs, one cluster has only one voxel, its t = 3.59 > >
> > I'm wondering how could one voxel surviving correction for multiple comparisons. > >
> > Best Regards > >
> > Jiansong > >
> > =============== > > Jiansong Xu, M.D., Ph.D. > > Dept. of Psychiatry > > Yale Medical School > > 2 Church St., Suite 215 > > New Haven, CT 06519 > > 203-785-5306
> > > > --------------------------------------------------------------------------- > > 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]" target="1"> > > [log in to unmask] http://www.fmrib.ox.ac.uk/~steve> > --------------------------------------------------------------------------- > >
> > > > > > |
> -- > Saad Jbabdi > University of Oxford, FMRIB Centre >
> JR Hospital, Headington, OX3 9DU, UK > +44 (0) 1865 222523 (fax 717) >
>
>
>
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