Hi SCT team,
I recently wanted to compare the performance of slice-wise motion correction with and without the polynomial regularization contained in sct_fmri_moco (using sct 4.3 on Ubuntu 18.04).
However, when I set poly=0 (which I understood from the help text to mean that no regularization will be performed), I didn’t see any effect of the motion correction, i.e. the resulting images looked identical to the input. Interestingly, the motion parameter .tsv file also contained only zeros.
I then checked the underlying ANTs routine (using ants 2.3.1 on Ubuntu 18.04) and observed a similar behavior, i.e. no correction being performed.
I am just wondering if I misunderstood the usage of sct_fmri_moco or whether this is a known bug / expected behavior?
All the best,