freesurfers, i've been using my own scripts to compute tSNR for data i was running through FSL, but i'm now running the data through freesurfer and i wanted to better understand what the fsnr volumes spit out by selxavg3-sess are. i poked around the wiki and mailing archives and couldn't find answers to the following questions:
1. how is fsnr computed? tsnr is <mean_of_vox_time_course>/<std_of_vox_time_course> -- is fsnr the same thing with a different name? 2. what kind of preprocessing is done on the data before fsnr is computed? since freesurfer removes linear trends at the modeling stage, not the preprocessing stage, are linear trends removed from the data going into fsnr calculations? is anything else regressed out before fsnr is computed (e.g., other nuisance regressors)? 3. what's the difference between raw.fsnr.nii.gz, fsnr.nii.gz, and fsnr2.nii.gz? 4. is fsnr.dat the mean in the whole brain mask (i.e., gm and wm)? separately, random other question: what are the h.dat, h.nii.gz, and h-offset.nii.gz file/volumes? thanks in advance! alex kell
_______________________________________________ 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.
