Hi Doug,
I have 3 functional runs that have a different number of TRs (from all subjects). The design is rapid event-related and the different runs are matched for statistical power despite that the number of trs is different for each run.
I would like to contrast the runs with different ntrs as a first level analysis (within subjects to begin with). However there is only one seq.info file (that contains the ntrs value). Hence selxavg-sess fails if I try to analyze the runs at the same time. The Freesurfer wiki says that runs should have the same ntrs, but this is not possible in this case.
Is there a way around this problem? For example, if selxavg-sess is the only step that reads the ntrs value, can I just change the contents of the seq.info file and do the selxavg-sess step for the runs separately? Or do other analysis steps also need a correct ntrs value?
Also can I tell selxavg-sess to look for a custom filename instead of seq.info? This might make things more flexible.
Thanks!
-Tommi
--- Tommi Raij, M.D., Ph.D. MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging Bldg 149, 13th St Charlestown, MA 02129 U.S.A.
raij@nmr.mgh.harvard.edu