What is the appropriate size for a surface based seed? I am referencing a study with volumetric based seeds with spheres with a radius of 3mm (in fMRI data). I would like to do a similar study using surface based representations. In a volumetric based analysis folding may actually increase the amount of cortical surface represented in a sphere. Using a circle on the surface with a 3 mm radius therefore would not be the same. But…. is the difference so minimal and variable across the cortex that it is not worth considering especially since the seeds are derived from published work and not using a localizer?
Do you know of any published guidelines on generating seed sizes in surface based models, not based on a localizer. Or is this the completely wrong approach? Should I be using the tal coordinates to locate which parcellation of the available atlases that the seed was located in? (for example i have a fusiform face area seed which I have set as a circle 3mm radius) many thanks for your continued help Erik _______________________________________________ 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.
