Thanks again for your input! I made some output surfaces and now I have another question:

 

Instead of creating a surface image directly from of these lesion-maps, I’d like to try to create a “derived” cortical lesion-map. In a similar fashion to the mri_aparc2aseg --labelwm (but in the other direction), I’d like to apply the label of my native T1w lesioned white matter to that of the surrounding cortex (with a dmax parameter). Does something like this already exist? 

 

My end result would be a binary mask of part of the cortex that is within some distance of the lesion. 

 

My other intuition is to just dilate the lesion ROI to encompass the cortex and find the overlap but this method seems crude. Maybe there’s a more appropriate tool for this I’m not aware of?

 

Thanks,

Mitch

 

From: Greve, Douglas N.,Ph.D. <DGREVE@mgh.harvard.edu>
Date: Thursday, September 10, 2020 at 12:36 PM
To: Horn, Mitchell Jacob <MJHORN@mgh.harvard.edu>, Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] vol2surf: lesion overlap across group into surfaces

The question is more for you. The lesions are not on the  surface but you want to display them on the surface. How do you want to do that?
ps. please remember to post to the list

On 9/10/2020 10:25 AM, Horn, Mitchell Jacob wrote:

Thanks so much Douglas.

 

Many of the lesions are in the white matter, and many span across WM and GM. In the case where the lesions on not strictly cortical, is this surface mapping not possible? Or perhaps a representative surface map showing the occurrences of lesions in any lobe/ROI?

 

Best,

Mitch

 

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