Tckconvert on whole-brain tractogram

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Hi all,

I have a whole-brain tractogram with 5 million streamlines and I an trying to extract the endpoint coordinates of each streamline with tckconvert:

txt_out = fullfile(outDir_tmp , sprintf(‘%s_%s_endpoints-.txt’, Subject, tag));
cmd2 = system(sprintf(‘tckconvert %s %s -nthreads 64 -force’, endpoints_tck, txt_out));
assert(system(cmd2) == 0, ‘tckconvert failed’);

  1. Is there a way of extracting the endpoint coordinates without saving individual streamline files? This takes up a lot of memory and is not feasible for multiple subject (we have over 30).
  2. Do you have any other suggestions on how I could find my endpoint coordinates? I already have the connectome.csv and assignments.txt files obtained from tck2connectome but also need the endpoint coordinates for assigned streamlines to bring each coordinate to cifti space (later).

Thank you!