Hello,
I'm not sure what you mean here.
Do you mean that the resolution of B is higher
than A, but there are the same number of voxels?
For example, A is 128x128x128 with 2mm cubic voxels
and B is 128x128x128 with 1mm cubic voxels? Is this
the kind of thing you mean by a sub-image with the
same number of voxels?
I also don't understand what you mean by "mask the area".
Do you mean you want to find where image C fits into image
A and then create a mask image in the space of image A
which is ones inside the area of image C but zeros elsewhere?
Also if your image is "distorted" then you might find it difficult to
register using linear registration (with FLIRT) and may need
to use non-linear registration (with FNIRT - although this will
require an initial registration with FLIRT).
If you can explain what you are trying to do then hopefully
we can help.
All the best,
Mark
On 23 Dec 2009, at 05:08, Xi LIANG wrote:
> Dear all,
>
> I register brain image A to B by using FLIRT, and get image C. The
> image B is a distorted sub-image of the image A, but A and B has the
> same number of voxel. Therefore, the image C will be a sub-image of
> the image A as well. What I want to do is mask the area of image C
> in the image A. Any suggestions are welcome.
>
> Regards,
>
> Xi
>
>
>
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