It might be a little more accurate, but my guess is that it will not make much of a difference.
On 1/30/19 2:01 PM, Matthieu Vanhoutte wrote: > > External Email - Use Caution > > Dear Freesurfer’s experts, > > I have read the paper from Marcoux, et al. « An Automated Pipeline for > the Analysis of PET Data on the Cortical Surface ». /Frontiers in > Neuroinformatics/12 (10 décembre 2018). > https://doi.org/10.3389/fninf.2018.00094. In this paper, they propose > a robust PET signal projection based on weighting multiple PET > projections at different fractions of the cortical thickness. They > used « mris_expand" instead of "mri_vol2surf --projfrac" based on the > following comments: > > /"We mainly rely on the mris_expand function of FreeSurfer rather than > on vol2surf. The vol2surf function allows the user to project volume > data onto the cortical surface by sampling along the normal of the > white surface, by steps corresponding to fractions of the cortical > thickness. We observed that the main issue with this approach is its > lack of accuracy and robustness, as there is no constraint to ensure > that the last sample will be on the corresponding vertex of the pial > surface. Another solution proposed by FreeSurfer is to use the normal > fromthemid surface, starting on the side of the white surface and > going toward the pial surface, sampling by steps proportional to the > thickness. Here again we observed that, because of different folding > patterns, sampling points could be located outside the cortical > ribbon. Our approach, using deformable surfaces obtained with > mris_expand, ensures that the seven surfaces that are used to project > the signal follow the folding patterns and stay within the cortical > ribbon."/ > / > / > Is "mris_expand" more accurate and robust than "mri_vol2surf > --projfrac" according to you ? > > Best, > Matthieu > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
