Combining nodes to create ROIs for connectome2tck

Dear MRtrix experts,


I am trying to extract streamlines olfactory cortex connected to target ROIs using connectome2tck.

When doing so, I have a problem with using -nodes options for connetome2tck command.

I want to combine AAL labels to create target ROI (such as combining AAL label 5 and 6 regions for superior frontal gyrus, dorsolateral part, or 21+22 for olfactory cortex).

However, listing this nodes such as -nodes 5,6,21,22 would create streamlines connecting each of the nodes not connecting 5+6 with 21+22.

I’d appreciate any help.