If you run mri_info on it, you will see an orientation (eg, axial,
saggitta, coronal). Most of the time PET images are delivered in axial
format in which case you would spec --psf-slice as the axial PSF
On 6/19/2025 12:44 PM, Finn, Quentin wrote:
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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" <[email protected]>
Subject: [Freesurfer] Re: Nonhomogenous PVC with mri_gtmpvc
To: [email protected]
Message-ID: <[email protected]>
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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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