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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Daniel Glen
November 09, 2009 02:29PM
Here are a few simple things you can do with 3dDespike's spikiness. 3dcalc is uses to identify a voxel at a point in time as spike using the 2.5 threshold. Then the number of spikes are summed across time with 3dTstat. 3dBrickStat gives the maximum number of spikes and the total number of spikes within a range of values (from 2 to 32 spikes at that voxel).

3dDespike -ssave spikiness -prefix despiked epi_r1+orig
3dcalc -a spikiness+orig. -expr 'step(a-2.5)' -prefix spike
3dTstat -sum -prefix spikesum spike+orig.
3dBrickStat -max spikesum+orig
32
3dBrickStat -count -non-zero spikesum+orig'<2..32>'
33839

You may also want to check 3dTqual and 3dToutcount for other statistical quality measures.
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Subject Author Posted

Despike

Michael Amlung November 09, 2009 01:20PM

Re: Despike

Daniel Glen November 09, 2009 02:29PM

Re: Despike

Michael Amlung November 09, 2009 02:53PM

Re: Despike

Daniel Glen November 09, 2009 05:29PM

Re: Despike

Michael Amlung November 09, 2009 08:54PM

Re: Despike

Michael November 13, 2009 03:48PM

Re: Despike

Michael November 13, 2009 03:55PM

Re: Despike

Daniel Glen November 13, 2009 04:53PM