If I understand you correctly, you have an ROI defined in the volume and you want to transfer it to the surface. Is that right? First you should look at the ROI in the volume along with the surfaces and make sure that they pass through the ROI. I would generally use the projfrac-max option for something like this. After you get a surface overlay, you can map it back to the volume (mri_surf2vol) and see if it looks right relative to the full volume ROI.
On 5/21/2021 6:41 AM, M Pope wrote:
External Email - Use Caution
External Email - Use Caution
Hi all,
I have a question regarding checking the output of mri_vol2surf. I am converting a manually segmented volume ROI into a surface label in order to gain information such as cortical thickness. What is the best practice for quality control and checking the surface rendering of the ROI? Are there any protocols or suggestions? As slight changes in projfrac change the output by a large degree, it's difficult to assess what is the closest to the original volume ROI. The suggestions also vary (others say projfrac 0.5, others to use projfrac-max or projdist). The main output statistic I'm interested in cortical thickness of the region (if this influences the options).
How do you choose and establish what is the best option?
Thanks Marianna
Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://secure-web.cisco.com/1crndCNiNtoGVMPUhoNnIxDSbZaX5xv97bIlJ1N0pCUII7E...