I want to run a multi-contrast longitudinal Samseg (ms lesions), but not all timepoints are consistent with regards to which contrasts are available (some have only T1s, some have both T1 and T2).

As stated in the wiki, `run_samseg_long` does not accept such inconsistent input, but is there a natural workaround for it? So far I lean towards running only those timepoints that contain the full set of contrasts, and subsequently running the cross sectional stream on those timepoints that don't. Does that make sense?

Thank you very much!