Hi Sam

they are not the same. A label is just a list of vertices in the surface (with some possibly voxel coordinates and also with a single value/vertex). It doesn't have to be ever vertex in the surface, and also contains no information about topology (e.g. which vertices are connected by an edge)

cheers Bruce

On Wed, 24 Jul 2019, Sam W. wrote:

External Email - Use Caution

Thanks Bruce. Can I ask you a very basic question? What exactly is the difference between a surface and a label file? I thought the difference was that the label file is just a normal text file containing the vertices that are used to construct a surface. If so, is there a tool that allows me to create a surface from a label file? mri_label2surf would be my first guess, but that doesn't seem to exist. Best regards, Sam

On Wed, Jul 24, 2019 at 4:18 PM Bruce Fischl fischl@nmr.mgh.harvard.edu wrote: Hi Sam

  the labels are already ascii

  cheers
  Bruce
  On Tue, 23 Jul 2019, Sam W. wrote:

  >
  >         External Email - Use Caution        
  >
  > Hi,
  >
  > Is it possible to convert a label file like rh.cuneus.label
  into asc? I
  > tried
  > mris_convert --label rh.cuneus.label ctx-rh-cuneus rh.white
  rh.cuneus.asc
  >
  > but got an error:
  >  
  > ERROR: unknown file annot file type specified for output:
  rh.cuneus.asc
  >
  > Thanks!
  > Sam
  >
  >
  >_______________________________________________
  Freesurfer mailing list
  Freesurfer@nmr.mgh.harvard.edu
  https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

The label file has much less info than the surface file (eg, does not have neighborhood relations). mri_label2vol requires that a full surface file be provided. It might not be obvious because it usually finds the surface based on the subject name.

On 7/25/19 3:29 PM, Sam W. wrote:

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Thanks Bruce, that's helpful! I take it that it's not possible to create a surface file simply using the information in the label file then? The reason I'm confused is that "mris_convert lh.white lh.white.asc" will convert a surface file to asc. The contents of lh.white.asc look similar to what a label file contains, so I thought you could easily convert a label into a surface and vice versa. Also, if the label does not contain information about topology, how are we able to convert a label to a volume with mri_label2vol? Thanks in advance! Sam

On Wed, Jul 24, 2019 at 10:42 PM Bruce Fischl <fischl@nmr.mgh.harvard.edu mailto:fischl@nmr.mgh.harvard.edu> wrote:

Hi Sam

they are not the same. A label is just a list of vertices in the
surface
(with some possibly voxel coordinates and also with a single
value/vertex).
It doesn't have to be ever vertex in the surface, and also
contains no
information about topology (e.g. which vertices are connected by
an edge)

cheers
Bruce


On Wed, 24 Jul 2019, Sam W. wrote:

>
>         External Email - Use Caution
>
> Thanks Bruce. Can I ask you a very basic question? What exactly
is the
> difference between a surface and a label file? I thought the
difference was
> that the label file is just a normal text file containing the
vertices that
> are used to construct a surface. If so, is there a tool that
allows me to
> create a surface from a label file? mri_label2surf would be my
first guess,
> but that doesn't seem to exist.
> Best regards,
> Sam
>
>
> On Wed, Jul 24, 2019 at 4:18 PM Bruce Fischl
<fischl@nmr.mgh.harvard.edu <mailto:fischl@nmr.mgh.harvard.edu>>
> wrote:
>       Hi Sam
>
>       the labels are already ascii
>
>       cheers
>       Bruce
>       On Tue, 23 Jul 2019, Sam W. wrote:
>
>       >
>       >         External Email - Use Caution
>       >
>       > Hi,
>       >
>       > Is it possible to convert a label file like rh.cuneus.label
>       into asc? I
>       > tried
>       > mris_convert --label rh.cuneus.label ctx-rh-cuneus rh.white
>       rh.cuneus.asc
>       >
>       > but got an error:
>       >
>       > ERROR: unknown file annot file type specified for output:
>       rh.cuneus.asc
>       >
>       > Thanks!
>       > Sam
>       >
>       >
>  >_______________________________________________
>       Freesurfer mailing list
> Freesurfer@nmr.mgh.harvard.edu
<mailto:Freesurfer@nmr.mgh.harvard.edu>
> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
>
>
>_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu>
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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