Hi Ruth, Ged, and Chris,
A word of caution when using xjview. There have been some recent issues
where it became apparent that it may be flipping hemispheres. Otherwise,
it's a great program.
Emily
>>> Christopher Summerfield <[log in to unmask]>
05/22/06 5:39 AM >>>
hi Ruth & Ged,
once you know the FDR-corrected t-value, then it's easy to threshold
your
image at that level using xjview
http://people.hnl.bcm.tmc.edu/cuixu/xjView/
all the best,
Chris
Christopher Summerfield
[log in to unmask]
On Mon, 22 May 2006, Ged Ridgway wrote:
> Hi Ruth,
>
> I'm also interested in doing this. So far I've worked out that we
> could use something like:
>
> t_crit = spm_uc_FDR(0.001,df,'T',1,tmap_vol)
>
> to find the t-threshold corresponding to FDR correction at the 0.001
> level, where df is the number of degrees of freedom for the t-map, and
> e.g. tmap_vol = spm_vol('your_tmap.img'). I think this is right for
> both spm5 and spm2. (see e.g. help spm_uc)
>
> Thresholding the t-map is then simple, but I've not yet investigated
> how to get the thresholded map into the results window. I think it may
> be necessary to create a basic spm.mat with an appropriate
> structure, but I'm not sure what the minimal set of fields would be.
>
> You'll probably get a more complete answer from someone like John; if
> not, I'll try to have a look and get back to you if I work it out...
>
> Best,
> Ged.
>
>
> Ruth Heller wrote:
> > Hi,
> > I've got my own T-map (in analyze format) that I would like to feed
into SPM in
> > order to correct for multiple comparisons and display the results
using its
> > graphics window. Is there a way to feed my map into SPM (instead of
feeding the
> > original data and performing the whole analysis in SPM)?
> > Thanks,
> > Ruth
> >
> >
> >
> > ----------------------------------------------------------------
> > This message was sent using IMP, the Internet Messaging Program.
> >
>
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