Hi,
> Step 3- do the registration between your images using
> this weighting volume appropriately
>
> I am not able to understand this step because i hearing "weghting
> image" idea for this first time here, so can you explain to me on
> this a little more like after creating this weighting image of ones
> and zeros, should i have to make this weighting image same size as
> that of step 1, do it need to multiply this with my image_2
> (contiguous slice image).
A weighting image allows each voxel to be weighted, so that a zero
value gets ignored.
You can either have a weighting image in the same space as the input
image, which is
the -inweight option in flirt, or in the same space as the reference
image, which is the
-refweight option in flirt. You don't need to do any multiplication
or anything, just
create the image as described and then use it with either -inweight or
-refweight, as
appropriate.
> It might be simpler for the registration code in this case to treat
> your created image above as the reference image, and hence the
> weighting image as -refweight.
>
> Note that it is important that you do not put zeros in the even
> slices for the ref image itself, as the smoothing
> would be affected by the zeros in a bad way.
> I am sorry that i am not able to understand this step also because
> you have mentioned not to put zeros in even slices for ref image
> but in the previous step you have suggested to me to use weighting
> image as reference image, may this will be clear if i understand
> what it means by "weighting image",
Sorry, this was meant to be extra clarification, not confusing.
Do not put zero slices in the image itself - which I think you
understand.
This was just meant to reinforce this fact.
You do want alternating slices of zeros and ones in the weighting image.
Hope this is clearer.
All the best,
Mark
|