If you just want to calculate the number of activated voxels from the results of your FEAT analysis, just use fslstats thresh_zstat.nii.gz -V on the thresh_zstat image. The thresh_zstat image is nonzero where the thresholding you selected determined the voxels to be active.

Is that what you wanted?

Eugene

2009/8/25 Eric Zalusky <[log in to unmask]>

I am trying to calculate the number of activated voxels in the whole brain.

Am I correct in saying that the zstat is the uncorrected and the thresh_zstat

is the corrected? If not, what is the difference?

In order to calculate this I am taking the zstat file and using -ztop to get a

pstat image. Then I use a program in MatLab to calculate global and regional

activation using different masking and a p value = 0.05. Would this be the

correct way to do this? Is there a program in FSL to do this calculation? I

need to have a p = 0.05

Thanks,

Eric Zalusky

--

Eugene Duff

Centre for Functional MRI of the Brain (FMRIB)

University of Oxford

John Radcliffe Hospital, Headington OX3 9DU Oxford UK

Ph: +44 (0) 1865 222 523 Fax: +44 (0) 1865 222 717

--