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  

Previous Message Next Message
Message List New Topic Print View
|
Gang Chen
May 17, 2006 04:40PM
> Are there any advantages/disadvantages to running a cluster analysis on a
> dataset with a smaller voxel size (e.g. 1x1x1 mm^3 vs 3x3x5)? e.g. if you scan
> at 3x3x5, is there any sense or lack of sense in sampling at smaller voxel size
> (with adwarp) before you run a cluster analysis?

It would be easier to form clusters with a dataset in lower resolution. For example, with 1x1x1 mm^3 clusters are analyzed by the increment of 1 mm^3 while the increment would be 45 mm^3 in the resolution of 3x3x5 mm^3. It makes more sense to go with the original EPI resolution during cluster analysis, but the difference is probably not too big.

> I've noticed that smaller voxels makes alphasim take forever..

Basically it carries much (45 times) more simulations with 1x1x1 resolution.

Gang
Reply Quote
RSS
Subject Author Posted

clustering and voxel sizes

Drew May 17, 2006 03:38PM

Re: clustering and voxel sizes

Gang Chen May 17, 2006 04:40PM

Re: clustering and voxel sizes

Rutvik Desai May 17, 2006 05:31PM