Hi Mark and Stefano,
I'm also interested in performing anisotropic smoothing; would you mind providing some more details on this?
Per your last post, "you can apply an anisotropic smoothing by creating a custom kernel file. This needs to be a nifti image and will be fairly small (the size of the non-zero kernel) and filled with whatever values you wish it to have). We recommend that it has the same voxel size as the image you will apply it to."
1) Do the intensity values of the nifti kernel file matter, or just need to be >0?
2) I'm using 2mm isotropic functional data and want to do smoothing at intervals <2mm, e.g. FWHM=1.5mm smoothing in the X, 3mm in the Y, and 4.5mm in the Z. Is this possible?
3) Related to 3, how can I make the relevant kernel file the desired size while still using the same voxel size as the target data? It seems like this nifti would need to be composed either of a single 1.5x3x4.5mm voxel or of multiple smaller voxels (e.g. 1x2x3 @ 1.5mm isotropic).
Many thanks,
-Ely
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