Hi Bruce

Thanks for your response. In the help, I found the following options. Is the fwhm based on voxel unit? Does nsmooth-in or-out control the number of stacked smoothing?

--fwhm-src fwhmsrc: smooth the source to fwhmsrc

--fwhm-trg fwhmtrg: smooth the target to fwhmtrg

--nsmooth-in N : smooth the input

--nsmooth-out N : smooth the output

Best

Jiaen

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Fischl, Bruce R.,PHD
Sent: Thursday, April 11, 2024 14:24
To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] surface-based filtering

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Yes, we support surface-based smoothing. Check out the help for mri_surf2surf

Cheers

Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Jiaen Liu
Sent: Thursday, April 11, 2024 2:14 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] surface-based filtering

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I’m wondering if freesurfer provides functions to filter the surface data within certain neighborhood exclusively on the surface. It’s essentially similar to regular smoothing in 3D space. But the filtering kernel only runs on the surface.

I can think of a solution to filter adjacent vertex in the surface file. But I’m not sure if the adjacent vertex is also close in space.

Thanks!

Best regards,

Jiaen Liu Ph.D.

Assistant Professor

Advanced Imaging Research Center & Radiology

UT Southwestern Medical Center

2201 Inwood Ln

Dallas, TX, USA, 75390

Office: 214.645.2750

Website: Liu (Jiaen) Lab | UT Southwestern, Dallas, Texas

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Medical Center

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