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Hi Phillip

The flattening preserves vertex correspondence between the flat maps and all our surfaces (for that hemisphere). So if you can map data onto the flattened patches, you should be able to look up the vertex index and use that to go from flat patch to white or pial or inflated (which all have the same number of vertices)

Cheers Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Phillip Tran Sent: Friday, August 4, 2023 11:37 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Is there an inverse function to mris_flatten?

External Email - Use Caution Hello FreeSurfer team,

I'm new to FreeSurfer and would greatly appreciate your help. My objective is to reverse the flattening process of mris_flatten.

I successfully got flatmaps by using mris_flatten on "bert" inflated hemispheres with manual relaxation cuts (in Freeview/tksurferfv as opposed to deprecated tksurfer) as directed by these instructions:

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I also have a small 2-D patch of non-MRI image data that's been registered to and fused with the hemisphere flatmap. Is there an inverse function or procedure for mris_flatten?

E.g.: I would input a .dcm/.jpg/etc. containing the patch-fused flatmap, then get in response the original inflated hemisphere with the fused patch appropriately deformed to fit the 3d shape.

Then, is there potentially a way to return the patch-fused inflated hemisphere back into the pial surface from which it was inflated?

FreeSurfer version: freesurfer-linux-ubuntu22_x86_64-7.4.1-20230614-7eb8460 Ubuntu version: 22.04.2 Jammy Jellyfish

Thank you for your time, Phillip