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

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Lukas Pezawas
April 29, 2003 09:28AM
Hi AFNI-Experts!

I wonder, if the following masking procedure would be reasonable and would be ok for any further statistical analysis:

The EPI-mask is based on the deconvolution error-output. Since the standard error is apparently high at the edges of the brain probably due to partial volume effects, it would be desirable in my point of view to exclude these voxels of any smoothing procedure across subjects. I calculated the MAD (with 3dTstat) of the error 3D+time BRIK and zeroed all voxels out higher than 2.5, which looked quite good in my datasets.

I wonder, if anyone sees any problems in that procedure?

Thanks,

Lukas
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Masking

Lukas Pezawas April 29, 2003 09:28AM

Re: Masking

Lukas Pezawas April 29, 2003 08:11PM