PowerPoint Presentation - Time Series Analysis in AFNI

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Preparing Data for Analysis

• Six preparatory steps are common:

H Image registration (realignment): program 3dvolreg

H Image smoothing: program 3dmerge

H Image masking: program 3dClipLevel or 3dAutomask

H Conversion to percentile: programs 3dTstat and 3dcalc

H Censoring out time points that are bad: program 3dToutcount or 3dTqual

H Catenating multiple imaging runs into 1 big dataset: program 3dTcat

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• Not all steps are necessary or desirable in any given case

• In this first example, will only do registration, since the data obviously needs this correction