Hi Sarah

Sorry, I’m not sure we have much to add. We don’t flatten much any longer, and the cuts are kind of ad hoc – the one around the medial wall to get rid of non-cortical stuff, then the radial ones from there to remove particularly the curvature from the 3 poles. Mostly we just follow what Anders and Marty started doing way back when

Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu <freesurfer-bounces@nmr.mgh.harvard.edu> On Behalf Of Sarah Lavelle
Sent: Tuesday, October 25, 2022 5:30 AM
To: freesurfer@nmr.mgh.harvard.edu
Subject: [Freesurfer] help

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Dear freesurfer,

Are there any additional resources on how to make cuts? I have found this MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be https://surfer.nmr.mgh.harvard.edu/fswiki/recon-all#Flattening but it isn't enough for the project I am doing. I want to flatten the whole surface but I may need to change where I am cutting from patient to patient. How do you know how big the hole should be? and how many relaxation cuts should you make? How long should they be? If you have any more guidance on how to cut to minimise distortion, please let me know!

Also when I perform the mris_flatten function using my patch, my terminal gives me a % near the end saying "41% total metric distortion". Can you confirm that this value is the total metric distortion from an inflated surface to a flatmap surface using my chosen patch?

Many thanks,

Sarah Lavelle

Trinity College Dublin