Sorry, I don’t see what black dot you are referring to. As for being different,
when the distances it uses are random it will change run to run. Basically you
hope some of them prevent the patch from folding on itself (which it will
definitely be prone to if the distances are only nearest neighbor)
From: Nasr, Shahin,Ph.D. <shahin.n...@mgh.harvard.edu>
Sent: Saturday, April 8, 2023 11:47 AM
To: Fischl, Bruce R.,PHD <bfis...@mgh.harvard.edu>; Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu>
Subject: Re: mris_flatten Version 6 vs. 7
Hi Bruce,
Adding -distance 20 20 definitely helped (see the attached file). Even
though, the outcome is still different than what we see based on Version 6 (my
previous emails), which might be OK. But do you notice the black dot (missing
vertex) at the tip of calcarine sulcus? Any idea why that is happening? Any
solution for that?
Regards,
Shahin Nasr, Ph. D.
Assistant Professor in Radiology
Harvard Medical School
https://mesovision.martinos.org/
________________________________
From: Fischl, Bruce R.,PHD
<bfis...@mgh.harvard.edu<mailto:bfis...@mgh.harvard.edu>>
Sent: Saturday, April 8, 2023 10:14 AM
To: Nasr, Shahin,Ph.D.
<shahin.n...@mgh.harvard.edu<mailto:shahin.n...@mgh.harvard.edu>>; Freesurfer
support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: RE: mris_flatten Version 6 vs. 7
Can you try running it with -distances 20 20 added to the command line?
From: Nasr, Shahin,Ph.D.
<shahin.n...@mgh.harvard.edu<mailto:shahin.n...@mgh.harvard.edu>>
Sent: Saturday, April 8, 2023 8:59 AM
To: Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Cc: Fischl, Bruce R.,PHD
<bfis...@mgh.harvard.edu<mailto:bfis...@mgh.harvard.edu>>
Subject: Re: mris_flatten Version 6 vs. 7
Dear Bruce,
I ran mris_flatten with -norand flag (mris_flatten -norand
rh.occip.patch.3d rh.occip.patch.flat) and it still fails (see the attached
file). I can share the patch with you if you want. But it is a surprise
because version 6 generate the flattened patch without any problem.
Also FYI, this problem is NOT limited to this specific patch. I have
applied it to multiple other occipital patches (from other subjects) and the
outcome is the same.
Regards,
Shahin Nasr, Ph. D.
Assistant Professor in Radiology
Harvard Medical School
https://mesovision.martinos.org/
________________________________
From:
freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>
<freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>>
on behalf of Fischl, Bruce R.,PHD
<bfis...@mgh.harvard.edu<mailto:bfis...@mgh.harvard.edu>>
Sent: Friday, April 7, 2023 5:21 PM
To: Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: Re: [Freesurfer] mris_flatten Version 6 vs. 7
Yes, well, that is totally my fault! Doug is much better about adding help text
than I am ☹
Bruce
From:
freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>
<freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>>
On Behalf Of Nasr, Shahin,Ph.D.
Sent: Friday, April 7, 2023 5:18 PM
To: Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: Re: [Freesurfer] mris_flatten Version 6 vs. 7
Hi Bruce,
In both versions, I use this command:
mris_flatten rh.occip.patch.3d rh.occip.patch.flat
They are applied to the same patch.
Also may be I missed it but when I used help (mris_flatten --help) I didn't see
any of these flags.
Regards,
________________________________
From:
freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>
<freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>>
on behalf of Fischl, Bruce R.,PHD
<bfis...@mgh.harvard.edu<mailto:bfis...@mgh.harvard.edu>>
Sent: Friday, April 7, 2023 5:11:49 PM
To: Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: Re: [Freesurfer] mris_flatten Version 6 vs. 7
External Email - Use Caution
Hi Shahin
What is your command line? mris_flatten does some random sampling of distances
since the whole N^2 distance matrix is too big. You can remove the randomness
by either specifying -norand or using a specific seed like -seed 1234.
That said, you second image looks like a failure of the flattening. This
usually means the distances aren’t sampled out far enough/densely enough. The
defaults are super old (7 neighbor ring, 12 distances/ring). You could try
something like -distances 20 20 and see if that fixes things (and -norand if
you want)
Cheers
Bruce
From:
freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>
<freesurfer-boun...@nmr.mgh.harvard.edu<mailto:freesurfer-boun...@nmr.mgh.harvard.edu>>
On Behalf Of Nasr, Shahin,Ph.D.
Sent: Friday, April 7, 2023 3:15 PM
To: Freesurfer support list
<freesurfer@nmr.mgh.harvard.edu<mailto:freesurfer@nmr.mgh.harvard.edu>>
Subject: [Freesurfer] mris_flatten Version 6 vs. 7
External Email - Use Caution
Hi Surfers,
This is the second time that I have brought this issue up. When applied
to the same 3D patch, the command mris_flatten generates two completely
different outcomes when runs under stable 6 vs. 711 (see the attached files). I
checked the documentation if there is any flags by which I can control the
process. But I couldn't find anything relevant. Any idea what has happened?
Regards
Shahin Nasr, Ph. D.
Assistant Professor in Radiology
Harvard Medical School
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