External Email - Use Caution
This is not something we have typically done with T1w/T2w myelin mapping. Is
there a reason you are especially concerned about these issues? We tend to
find that issues with surface placement, which are more prevalent at 1mm
isotropic than at higher resolutions, are a far bigger issue and I don’t know
that PETsurfer will help with this because it is based on the surfaces
themselves. I would recommend just sticking with the default HCP Pipelines
approach for T1w/T2w myelin mapping.
Matt.
From: <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Marina Fernández
<marina.fdez.alva...@gmail.com>
Reply-To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu>
Date: Tuesday, May 24, 2022 at 10:54 AM
To: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Tissue fraction effects correction
External Email - Use Caution
Dear FS experts,
We are planning to correct for tissue fraction effects on T1w/T2w ratio
images using PETsurfer, setting the point spread function estimate to
zero. My questions are:
1. Does it make sense to correct for tissue fraction effects on T1w/T2w
ratio images even when T1w and T2w images were acquired using the same
matrix size with identical voxel resolution (i.e., 1mm3)?
2. If that makes sense, which PVC method would work best for correcting
tissue fraction effects (i.e., SGTM, MG, RBV) on structural MRI scans?
Many thanks in advance.
Best,
Marina
________________________________
The materials in this message are private and may contain Protected Healthcare
Information or other information of a sensitive nature. If you are not the
intended recipient, be advised that any unauthorized use, disclosure, copying
or the taking of any action in reliance on the contents of this information is
strictly prohibited. If you have received this email in error, please
immediately notify the sender via telephone or return mail.
_______________________________________________
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 Mass General Brigham
Compliance HelpLine at https://www.massgeneralbrigham.org/complianceline
<https://www.massgeneralbrigham.org/complianceline> .
Please note that this e-mail is not secure (encrypted). If you do not wish to
continue communication over unencrypted e-mail, please notify the sender of
this message immediately. Continuing to send or respond to e-mail after
receiving this message means you understand and accept this risk and wish to
continue to communicate over unencrypted e-mail.
