Dear experts,
Could you please provide me the information how exactly the *_exvivo.thresh.labels have been thresholded?
According to this post, http://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg32542.html .thresh labels are thresholded to pick the most likely vertices that give a label that is the right surface area.But how they are thresholded in the boundary of the region where the unthresholded labels do not overlap? There must be additional threshold applied: For example for BA45 there is no further BA label towards frontal pole, but the BA45_exvivo.thresh.label is also restricted in this region wrt BA45_exvivo.label.
I have further question concerning used thresholding method of perirhinal_exvivo.thresh and entorhinal_exvivo.thresh labels. It seems that this method is not applied here since looking at them at the fsaverage surface, they are overlapping. And also *rhinal_exvivo.labels are much more extending to the adjacent regions than *rhinal_exvivo.thresh.labels. What method is applied here?
My main objective to obtain annotation with the vertices properly assigned to perirhinal_exvivo and entorhinal_exvivo to supply this annotation to mri_aparc2aseg to assign ribbon voxels to that parcellation. I think I could use mris_label2annot --maxstatswinner with unthresholded entorhinal and perirhinal labels to assign vertices to most probable label, but I would need to further threshold the labels by correct value to obtain results similar in extent to thresh.labels.
For perirhinal, it seems that the additional threshold is 0.4 (what is rationale for this value?), for entorhinal it seems also around 0.4 but could not find any particular threshold to obtain the exact shape of label corresponding to entorhinal_exvivo.thresh.
Thank you in advance for clarification.
Regards,
Antonin Skoch