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That's exactly what I mean — the word I should have used was "nonisotropic". 

Is there an easy way to tell what axes row/col/slice corresponds to? Is it correct that row/col are coronal and sagittal and slice is axial ?

Thanks again!


Message: 1
Date: Thu, 19 Jun 2025 12:35:13 -0400
From: "Douglas N. Greve" <dgreve@mgh.harvard.edu>
Subject: [Freesurfer] Re: Nonhomogenous PVC with mri_gtmpvc
To: freesurfer@nmr.mgh.harvard.edu
Message-ID: <a04213db-3e4c-48e6-b116-992332d96a13@mgh.harvard.edu>
Content-Type: multipart/alternative;
       boundary="------------900rUdJVaa2J4kXp3DWC9VFg"

I'm not sure what you mean. Are you saying the fwhm varies across axes? 
If so, you can pass different fwhms for each axis to mrI_gtmpvc with the 
--psf-col, --psf-row, --psf-slice options. If you are saying that PSF is 
space variant, then we don't have good options.

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