Dear Victor
The FWHM is specified in millimeters. SPM will take your voxelsize into account, if you don't know what your voxelsize is you can determine it using Check registration and right click on the image.
Best
Torben
Den 23/11/2010 Uge:47 kl. 02.45 skrev Victor Terry:
> Dear SPMers,
>
> I am using the Gaussian smoothing to preprocess the 3D-MRI images. The FWHM is set as 8mm-8mm-8mm in the interface of the SPM8 software.
>
> If the size of the voxel in the image is 2mm-2mm-2mm, is the actual FWHM 16mm-16mm-16mm?
> Does “8mm” in the SPM8 software mean “8 voxels” or not? Is the default voxel size 1mm-1mm-1mm or not?
>
>
> Thanks in advance.
> Victor
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