Hello, I am working through the PETsurfer surface based analysis and i have couple of question a) Since the procedure is the same as surface based analysis for cortical thickness except mri_vol2surf, Can I use the procedure for thickness? b) What is the difference between mris_preproc and mri_concat. If I use mris_preproc, do I also need to use mri_concat? Also, can I use mris_preproc instead of mri_concat? c) Can I use mri_surf2surf in place of mris_fwhm? If no, why? d) While researching PETsurfer surface based analysis in the forum, I came across multiple trends that used the "--projfrac" flag in both mri_vol2surf command and mris_preproc command. At what stage should I include this flag and why? e) If I want to perform a multimodal analysis using thickness&PET or Surface area&PET, Can anyone confirm if this is the correct steps.
- Perform surface base analysis for cortical thickness from step 1 (mris_preproc) to correction for multiple comparison - Perform PET surface based analysis from step 1 (gtmseg) to step 5. While conducting mri_glmfit, include the smoothed thickness map (?h.thickness.10B.mgh) as pvr (per vertex regressor) - e.g. mri_glmfit --y lh.pet.10.mgh --fsgd your.fsgd dods --pvr lh.thickness.10B.mgh --C contrast.mtx --surf fsaverage lh --cortex --glmdir pvr.lh.pet.thickness.glmdir - Lastly, build a new monte carlo correction for multiple comparison. Thank you Best, Paul
_______________________________________________ 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 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.
