Howdy-
As part of this large Demonstrating QC in FMRI project, we looked in depth at things to check during FMRI processing. One of those that we saw a number of times were odd lines of high variance typically going through the acquired plane in a narrow frequency+phase region through the slice planes. These have strong effects on cross-brain correlation patterns, which were discussed here:
- Reynolds RC, Taylor PA, Glen DR (2023). Quality control practices in FMRI analysis: Philosophy, methods and examples using AFNI. Front. Neurosci. 16:1073800. doi: 10.3389/fnins.2022.1073800
So, these are things we learned we should check for, and we have a tool in afni_proc.py (AP) that does so now. In your dataset's case, there weren't any found apparently.
To see an example of them in action, you can check out this recent MB post:
--pt