Yes, thanks ... from my notes:
This command contracts the selected surface vectors 3.0 mm and
places the resultant new surface file in surf/lh.white-3:
mris_expand lh.white -3.0 lh.white-3
Best regards,
Don
> -----Original Message-----
> From: freesurfer-boun...@nmr.mgh.harvard.edu [mailto:freesurfer-
> boun...@nmr.mgh.harvard.edu] On Behalf Of Bruce Fischl
> Sent: Saturday, February 13, 2016 2:37 PM
> To: Freesurfer support list
> Subject: Re: [Freesurfer] Freesurfer tool to automatically generate label
> surrounding a given vertex?
>
> mris_expand probably
> On Sat, 13 Feb 2016, Krieger, Donald N. wrote:
>
> > Thanks for posting back about this, Bruce.
> > I am thinking about a different function which probably is not called
> > --dilate.
> > One specifies a surface, e.g. white, and gets back a new surface displaced
> > by
> the distance you specify whose tangent is parallel to the tangent of the
> starting
> surface at the nearest point.
> >
> >
> >> -----Original Message-----
> >> From: freesurfer-boun...@nmr.mgh.harvard.edu [mailto:freesurfer-
> >> boun...@nmr.mgh.harvard.edu] On Behalf Of Bruce Fischl
> >> Sent: Saturday, February 13, 2016 1:44 PM
> >> To: Freesurfer support list
> >> Subject: Re: [Freesurfer] Freesurfer tool to automatically generate
> >> label surrounding a given vertex?
> >>
> >> Hi Don
> >>
> >> I think label2label --dilate does a morphological dilation on the
> >> surface, not a new surface. It is also independent of distance - it
> >> just uses topology - so your approach will be better if you truly
> >> want a circle (although of course if the surface is highly curved
> >> then the metric won't be quite right)
> >>
> >> cheers
> >> Bruce
> >> On Sat, 13 Feb 2016, Krieger, Donald N. wrote:
> >>
> >>>
> >>> Hi Martha,
> >>>
> >>>
> >>>
> >>> A brute force but simple way to do this is to use the list of labels
> >>> contained in subjects/nnn/label/lh.cortex and rh.cortex.
> >>>
> >>> Given a vertex x,y,z, go through the file and select the lines for
> >>> which the distance to x,y,z <= 2 mm. This will give you a bunch of
> >>> labels for points within a circle with 2 mm radius about x,y,z. And
> >>> all of them will be on the “white” surface. If your vertex is on a
> >>> different surface, e.g. pia, or you want a different geometry, e.g.
> >>> square, there’s likely a simple variant which will work.
> >>>
> >>>
> >>>
> >>> In my experience mri_label2label –dilate takes a lot of time and I’m
> >>> not sure you can restrict it to give you points on the surface that
> >>> you want. I think it gives you a new surface which is displaced by
> >>> a fixed distance from the one where you start.
> >>>
> >>>
> >>>
> >>> I hope this is helpful.
> >>>
> >>>
> >>>
> >>> Best - Don
> >>>
> >>>
> >>>
> >>> From: freesurfer-boun...@nmr.mgh.harvard.edu
> >>> [mailto:freesurfer-boun...@nmr.mgh.harvard.edu] On Behalf Of Martha
> >>> Shiell
> >>> Sent: Saturday, February 13, 2016 12:59 PM
> >>> To: freesurfer@nmr.mgh.harvard.edu
> >>> Subject: [Freesurfer] Freesurfer tool to automatically generate
> >>> label surrounding a given vertex?
> >>>
> >>>
> >>>
> >>> Hello Freesurfer community,
> >>>
> >>>
> >>>
> >>> I am looking for a way to automatically generate a surface label
> >>> file of a specific dimension (e.g. a circle with a specific
> >>> diameter, or a square), given a specific vertex and some measure of the
> desired size.
> >>>
> >>>
> >>>
> >>> I have considered to do so by starting with a label file consisting
> >>> of a single vertex, and then expanding this label with the
> >>> mri_label2label tool, using the --dilate option. I wanted to know
> >>> though if anyone has any better suggestions.
> >>>
> >>>
> >>>
> >>> Thank you,
> >>>
> >>> Martha
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Martha M. Shiell, PhD
> >>>
> >>>
> >>>
> >
> > _______________________________________________
> > Freesurfer mailing list
> > Freesurfer@nmr.mgh.harvard.edu
> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
> >
> >
> >
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