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Thanks for getting back on this, Doug.
I want to try a few things and make sure I understand what you’ve written
before I get back to you.
Best – Don
From: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> On Behalf Of Douglas N. Greve
Sent: Friday, December 10, 2021 6:31 PM
To: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] mri_label2label: one-to-one for subjectNo --> ico
Don, can you send your command line? If you are using surface-based
registration, then the origin should not matter. You are right that there is
not a one-to-one correspondence. The way it works is that it starts on the
target surface, goes through all the vertices and finds the closest vertex in
the source and maps the value. At this point, each target only has one source,
but each source may have multiple targets. By default, it then goes through
another loop where it finds all the source vertices that have not been mapped,
finds the closest target vertex, and maps the source to that target
(eventually taking the mean or sum of all the sources that map to a given
target). If it is the 2nd stage that is giving you problems, then you can turn
it off in mris_apply_reg with --nnf (stands for "nearest-neighbor-forward", vs
the default nnfr where r=reverse).
On 12/3/2021 8:41 AM, Krieger, Donald N. wrote:
External Email - Use Caution
Dear Bruce, Doug, and everyone,
1. I am projecting labels from a subject’s labels onto the icosahedron and
note that the mapping is not one-to-one. Because of this, I cannot tell which
subject vertex maps to which icosahedron vertex which I need to able to do.
What am I missing here?
2. Just double-checking something simple – The center of the icosahedron is
as the origin, i.e. 0,0,0, yes?
Thanks – Don
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