Dimensions of xcp_d-derived *_timeseries.tsv

Software Support
1

Hello,

I just wanted to verify: the number of rows of the output *-MNI152NLin2009cAsym_atlas-<atlas_name>_timeseries.tsv file after running xcp_d on fMRIPrep-preprocessed data, is not always equal to the number of TRs, but rather to the number of TRs that have not been deemed as outliers (as per the *_outliers.tsv file), right?

I was wondering because the latter tsv file appears to have a number of rows that is equal to the total number of TRs, but the number of rows on the *_timeseries.tsv file appears to be equal (in my analyses at least) to the (total number of TRs) - (the number of TRs that were given a value of 1 in the *_outliers.tsv file).

Thank you in advance!

Best,
Panos

2

That’s correct. The timeseries file will only contain non-outlier volumes and the correlation matrices are calculated only from those non-outlier volumes as well.

3

Perfect, thank you so much! And to verify one last thing: the ordering of volumes in the *_outliers.tsv file is in ascending order (i.e., row 10 corresponds to the 10th volume of the fMRI scan), right?

Best,
Panos

4

Yes, that is correct.

5

Awesome, thanks once again (and also for the great software)!

Best,
Panos