Dear Erick,
as Matt wrote you can use the img2stdcoord utility. That will take
voxel or mm coordinates (also non integer ones) and return it in
standard space coordinates.
Jesper
On 13 Dec 2010, at 17:52, Erick Canales Rodriguez (Benito Menni CASM)
wrote:
> Hi,
> My interest is to obtain the exact spatial location (xnew, ynew,
> znew) in the continuous MNI space corresponding to the point (x, y,
> z) in the continuous native space. That is,
>
> (xnew, ynew , znew) = (x, y, z) + displacement_field(x,y,z),
>
> In order to do this it is necessary to evaluate the displacement
> field at (x,y,z), where for example the coordinates of interest
> x=24.96863 mm, y=45.58982 mm, z= 90.18975 mm are different to the
> coordinates of the voxel that contains that point, for example,
> xvoxel=25 mm, yvoxel=46 mm, zvoxel=90 mm.
>
> The simple approximation is (xnew, ynew , znew) = (x, y, z) +
> displacement_field(xvoxel,yvoxel,zvoxel), due to the term
> displacement_field(xvoxel,yvoxel,zvoxel) can be computed directly
> with FSL tools.
> However, this approach is only an approximation...
>
> Many thanks,
>
> Erick
>
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