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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