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Question Posted 07/17/15:

How can I find out which resting state fMRI volumes are affected by the "pencil artifact" and which ones are not?

Also, where can I learn more about this artifact?

(this is the only resource I've been able to find: http://adni.loni.usc.edu/support/experts-knowledge-base/question/?QID=222 )
Response posted 07/24/15 by ADNI MRI Core:
Thank you for your question to the ADNI MRI Core.

The artifact is not assessed by individual volume. It is basically a spatial pattern of decreased temporal SNR, hence it applies to the entire series.

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