Dear Experts,
What is the best strategy to downsample a surface into diffusion (e.g. FA) resolution of the same subject? Thanks,
Sourena Soheili
Hi Sourena
what are you trying to do? You can sample the diffusion onto the surface easily enough, or map the surface into the diffusion coordinates with mri_surf2surf and bbregister, but why do you want to downsample it? Bruce
On Fri, 3 Feb 2012, Sourena Soheilinezhad wrote:
Dear Experts, What is the best strategy to downsample a surface into diffusion (e.g. FA) resolution of the same subject? Thanks,
Sourena Soheili
Hi Dr. Fischl Actually it's about generating the cortico-cortical connectivity matrix, and working with the original surface and upsampling the DW image results in creation of an enormous connectivity matrix. I have the impression that reducing T1 resolution down to DW and then running surface reconstruction is not a good option because of the partial volume effect. What can be the best solution here?
Cheers, Sourena
On Friday, February 3, 2012, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote:
Hi Sourena
what are you trying to do? You can sample the diffusion onto the surface
easily enough, or map the surface into the diffusion coordinates with mri_surf2surf and bbregister, but why do you want to downsample it?
Bruce
On Fri, 3 Feb 2012, Sourena Soheilinezhad wrote:
Dear Experts, What is the best strategy to downsample a surface into diffusion (e.g.
FA)
resolution of the same subject? Thanks,
Sourena Soheili
The information in this e-mail is intended only for the person to whom it
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Hi Sourena
what we usually do is it map it into fsaverage space, then downsample the icosahedron to ico5 (10K vertices) or so. Then it's manageable.
cheers Bruce On Fri, 3 Feb 2012, Sourena Soheilinezhad wrote:
Hi Dr. Fischl Actually it's about generating the cortico-cortical connectivity matrix, and working with the original surface and upsampling the DW image results in creation of an enormous connectivity matrix. I have the impression that reducing T1 resolution down to DW and then running surface reconstruction is not a good option because of the partial volume effect. What can be the best solution here?
Cheers, Sourena
On Friday, February 3, 2012, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote:
Hi Sourena
what are you trying to do? You can sample the diffusion onto the surface
easily enough, or map the surface into the diffusion coordinates with mri_surf2surf and bbregister, but why do you want to downsample it?
Bruce
On Fri, 3 Feb 2012, Sourena Soheilinezhad wrote:
Dear Experts, What is the best strategy to downsample a surface into diffusion (e.g.
FA)
resolution of the same subject? Thanks,
Sourena Soheili
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
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.
freesurfer@nmr.mgh.harvard.edu
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Bruce Fischl -
Sourena Soheilinezhad