Hi - when running FSL probtrackx with the "matrix 4" output, for use with workbench, memory use is greatly (non-linearly) increased by sending out more tracks per seed. The program is also much slower as memory use increases like that. Memory use can be prohibitive, so we only seed a few hundred lines which is not good statistically (hundreds of GB of RAM are needed).
it makes sense then to run the same task multiple times with different random seeds, and then merge the results. I noticed -wbsparse-merge-dense but clearly this is meant for different seed regions. It won't let me merge files where the surface seed and target voxels are both "CORTEX_RIGHT" is there a way round this? would the merge operation actually be what I want (a summation)? one could maybe rename the dimensions in the wbsparse file if so? potentially the source FSL output files could be merged, then make the traj file. I imagine I'd have to ask them about that, unless you happen to know. to be clear I'm asking if it is possible to sum each count and distance cell of dconn files to make a new one, only I want to do it with trajectory files partly for display, partly they are very much smaller files. In future I'll parcellate the surface and merge the traj files seeded from the parcels. Clearly that's the intent. best wishes, Colin Reveley _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
