Hi,
For this specific question your protocol is fine (though
I don't see any standard space priors here as suggested
in your previous emails).
I am assuming that all your images are of the same modality.
If not, then you need to do something different. However,
I will assume from here on in that they are of the same
modality.
It doesn't matter if you divide by 4 or not.
The reason the answer here might seem a bit different
from before is that it is not that common to average
multiple input images. However, you are not transforming
these to standard space, so it is fine. We strongly
discourage transformation to standard space before
segmentation. Here, though, you must align your images
(in the native space) before running segmentation, which
is what your protocol is doing.
All the best,
Mark
On 23 Nov 2010, at 21:23, SUBSCRIBE FSL Anonymous wrote:
> hi,
> i want to analyze csfventricles, total greymatter, and total whitematter:
> i have 1 subject with 4 *.nii.gz image files (same time point): my protocol says to
>
> 1)pick 1 of the images, use FLIRT to register the other 3 to the 1,,,, dof 6
> 2)then use fslmaths to sum these registered images (somewhere i saw that i should then divide by 4, but not sure)
> 3)run BET
> 4)then FAST
>
> anyone see a problem with this?
> thanks,
> paul
>
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