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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bob cox
February 09, 2004 10:23AM
PET data analysis requires some steps that aren't in the usual AFNI sequence. I'm not really familiar with PET data or its analyses. The one thing that I know is usually done is a global normalization of each image so that the spatial average number of counts is the same -- this is to account for dose differences between images. This could be done with a combination of 3dmaskave (with no mask) and 3dcalc. After that, I suppose 3dDeconvolve with minlag=maxlag=0 could be used to test various contrasts, using properly designed regressors. You probably would want to spatially blur (3dmerge -1blur_fwhm) the PET images before such an analysis.

Zorkon the nonPETolitrous
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AFni and PET data

teodora February 08, 2004 02:37PM

Re: AFni and PET data

bob cox February 09, 2004 10:23AM