AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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March 11, 2014 03:42PM
Hi, I'm trying to figure out the answer to a couple of questions I've had for a while now. I've been analyzing data on the cortical surface using a standardized mesh of -ld (linear division) of 125.
My first question is:
What is the actual grid size of this standardized mesh, in nodes/mm^2 (or in some other more appropriate metric)?

My second question is:
I'm assuming from previous message board posts that higher mesh densities (like -ld 141, which is one of the default outputs of @SUMA_make_spec_FS) more closely approximate the original mesh density of most input cortical surfaces. If this is the case, then if we transform and analyze typical epi data on a cortical surface with this mesh density, are we essentially resampling (and possibly oversampling) the epi data (typically with original grid size of 2x2x3 mm^3 or higher) to the anatomical resolution (which is typically around 1x1x1 mm^3)? Or am I completely missing the point here?

Jason
Subject Author Posted

Effective resolution of surface datasets

jason-avery March 11, 2014 03:42PM

Re: Effective resolution of surface datasets

nick March 12, 2014 08:12AM

Re: Effective resolution of surface datasets

ziad March 12, 2014 09:46AM

Re: Effective resolution of surface datasets

jason-avery March 12, 2014 05:28PM