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Hi Freesurfers,
The contrast between GM/WM may vary regions by regions. Some regions have high contrast, some regions have low contrast, is there a method can map the reliability of separating gray and subcortical white matter?
Thanks in advance, Yawu
Hi Yawu
we have tools for mapping G/W contrast and CNR, but of course that presupposes that our surfaces are in the correct location (more or less). You can for example use vol2surf to sample at negative and positive proj_dist and compute this kind of thing, or I believe Doug has some binaries that do it for you
cheers Bruce
On Thu, 19 Dec 2019, Liu Y wrote:
External Email - Use Caution
Hi Freesurfers, The contrast between GM/WM may vary regions by regions. Some regions have high contrast, some regions have low contrast, is there a method can map the reliability of separating gray and subcortical white matter?
Thanks in advance, Yawu
External Email - Use Caution
Hi Bruce, Thanks for the info. Can the tool display the vertexes with low G/W contrast? I would like to use those vertexes as a guide for visual evaluation. Cheers, Yawu
Bruce Fischl fischl@nmr.mgh.harvard.edu 于 2019年12月19日周四 16:52写道：
Hi Yawu
we have tools for mapping G/W contrast and CNR, but of course that presupposes that our surfaces are in the correct location (more or less). You can for example use vol2surf to sample at negative and positive proj_dist and compute this kind of thing, or I believe Doug has some binaries that do it for you
cheers Bruce
On Thu, 19 Dec 2019, Liu Y wrote:
External Email - Use CautionHi Freesurfers, The contrast between GM/WM may vary regions by regions. Some regions have high contrast, some regions have low contrast, is there a method can map
the
reliability of separating gray and subcortical white matter?
Thanks in advance, Yawu
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
sure, you should be able to make vertex-wise maps. I think Doug wrote something to do this, but if not I can modify mri_cnr to output mean and variance maps for gray and white easily enough.
cheers Bruce
On Fri, 20 Dec 2019, Liu Y wrote:
External Email - Use Caution
Hi Bruce, Thanks for the info. Can the tool display the vertexes with low G/W contrast? I would like to use those vertexes as a guide for visual evaluation. Cheers, Yawu
Bruce Fischl fischl@nmr.mgh.harvard.edu 于 2019年12月19日周四 16:52写道： Hi Yawu
we have tools for mapping G/W contrast and CNR, but of course that presupposes that our surfaces are in the correct location (more or less). You can for example use vol2surf to sample at negative and positive proj_dist and compute this kind of thing, or I believe Doug has some binaries that do it for you cheers Bruce On Thu, 19 Dec 2019, Liu Y wrote: > > External Email - Use Caution > > Hi Freesurfers, > The contrast between GM/WM may vary regions by regions. Some regions have > high contrast, some regions have low contrast, is there a method can map the > reliability of separating gray and subcortical white matter? > > Thanks in advance, > Yawu > >_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
The surf/?h.w-g.pct.mgh is a map of the white-gray percent difference
On 12/20/2019 9:13 AM, Bruce Fischl wrote: sure, you should be able to make vertex-wise maps. I think Doug wrote something to do this, but if not I can modify mri_cnr to output mean and variance maps for gray and white easily enough.
cheers Bruce
On Fri, 20 Dec 2019, Liu Y wrote:
External Email - Use Caution
Hi Bruce, Thanks for the info. Can the tool display the vertexes with low G/W contrast? I would like to use those vertexes as a guide for visual evaluation. Cheers, Yawu
Bruce Fischl fischl@nmr.mgh.harvard.edumailto:fischl@nmr.mgh.harvard.edu 于 2019年12月19日周四 16:52写道： Hi Yawu
we have tools for mapping G/W contrast and CNR, but of course that presupposes that our surfaces are in the correct location (more or less). You can for example use vol2surf to sample at negative and positive proj_dist and compute this kind of thing, or I believe Doug has some binaries that do it for you
cheers Bruce
On Thu, 19 Dec 2019, Liu Y wrote:
> > External Email - Use Caution > > Hi Freesurfers, > The contrast between GM/WM may vary regions by regions. Some regions have > high contrast, some regions have low contrast, is there a method can map the > reliability of separating gray and subcortical white matter? > > Thanks in advance, > Yawu > >_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edumailto:Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edumailto:Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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