Re: [Freesurfer] Surface down sample by taking cortical vertices only

[Dorothy Sincasto]

Hi

It is for computing sources correlation with symmetrical orthogonalized
correlations which is dependent on the rank of the data, so I am limited to
the number of sensors I use for estimating sources.

I would appreciate to know if there is any method to get about a 100
cortical vertices in the cortical surface, maybe with the inflated surface
generate an equidistant grid.

Thanks
Dorothy

On Mon, Apr 10, 2017 at 1:53 PM, dg wakeman  wrote:

> Hi Dorothy,
>
> That would be extreme under sampling. I don't expect it to be very
> meaningful.
>
> hth
> d
>
> On Mon, Apr 10, 2017 at 2:42 PM, Dorothy Sincasto 
> wrote:
> > Hi
> >
> > I want to do an MEG analysis and first I want to downsample the surface
> to
> > around 100 vertices per hemisphere.  I tried the command mris_downsample,
> > but when i plot the surface I see that the vertices go deep into the
> white
> > matter.
> >
> > Is there an option to extract for example 100 equidistant vertices from a
> > fsaverage?  Maybe knowing  how the vertices are organized when saved
> would
> > help, so for example, when I load a surface in matlab the vertices are
> shown
> > as a vector, is there a way to know the spatial order?
> >
> > Thanks
> > Dorothy
> >
> >
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Re: [Freesurfer] Surface down sample by taking cortical vertices only

[dg wakeman]

Hi Dorothy,

That would be extreme under sampling. I don't expect it to be very meaningful.

hth
d

On Mon, Apr 10, 2017 at 2:42 PM, Dorothy Sincasto  wrote:
> Hi
>
> I want to do an MEG analysis and first I want to downsample the surface to
> around 100 vertices per hemisphere.  I tried the command mris_downsample,
> but when i plot the surface I see that the vertices go deep into the white
> matter.
>
> Is there an option to extract for example 100 equidistant vertices from a
> fsaverage?  Maybe knowing  how the vertices are organized when saved would
> help, so for example, when I load a surface in matlab the vertices are shown
> as a vector, is there a way to know the spatial order?
>
> Thanks
> Dorothy
>
>
> ___
> Freesurfer mailing list
> Freesurfer@nmr.mgh.harvard.edu
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
>
>
> The information in this e-mail is intended only for the person to whom it is
> addressed. If you believe this e-mail was sent to you in error and the
> e-mail
> contains patient information, please contact the Partners Compliance
> HelpLine at
> http://www.partners.org/complianceline . If the e-mail was sent to you in
> error
> but does not contain patient information, please contact the sender and
> properly
> dispose of the e-mail.
>
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[Freesurfer] Surface down sample by taking cortical vertices only

[Dorothy Sincasto]

Hi

I want to do an MEG analysis and first I want to downsample the surface to
around 100 vertices per hemisphere.  I tried the command mris_downsample,
but when i plot the surface I see that the vertices go deep into the white
matter.

Is there an option to extract for example 100 equidistant vertices from a
fsaverage?  Maybe knowing  how the vertices are organized when saved would
help, so for example, when I load a surface in matlab the vertices are
shown as a vector, is there a way to know the spatial order?

Thanks
Dorothy
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The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.