Hi Rosie

The defects usually come from segmentation errors so I would fix those first Cheers Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Rosalia Dacosta Aguayo Sent: Saturday, June 26, 2021 2:49 PM To: Freesurfer support list freesurfer@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Topological and control point errors

External Email - Use Caution Hi Bruce,

Sorry, I refer to topological defects and white mater segmentation errors. What should I correct first?

Kind regards, Rosie

On Sat, Jun 26, 2021 at 6:25 PM Fischl, Bruce <BFISCHL@mgh.harvard.edumailto:BFISCHL@mgh.harvard.edu> wrote: Hi Rosie

I’m not sure what you mean by “control point errors”. The things control points are intended to correct, like B1- shading, can cause topological defects, so adding control points can fix the topology as well

Cheers Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edumailto:freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Rosalia Dacosta Aguayo Sent: Saturday, June 26, 2021 11:39 AM To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edumailto:freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] Topological and control point errors

External Email - Use Caution Dear Freesurfer experts,

I have noticed I have both topological and control point erros in my image.

What would you recommend me to do first, topological or the control points?

Kind regards, Rosie

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