Tckgen -maxlength value for interhemispheric connections

Hi all,

I’m somewhat of a novice with fiber tracking, looking for a bit of help.

I understand that the default value for tckgen is 100 * voxel size. When investigating interhemispheric connections, this understandably leaves very little fibers in the opposite hemisphere (400 x 400 x 264 / 0.525 mm voxelsize).

Considering fiber curvature, I am unsure how high to set this value. Will increasing it beyond a reasonable amount lead to many false positives? Any guidance appreciated.

I’ve included an image as an example. Based on my reading, I would expect more fibers reaching the opposite hemisphere through the splenium here, but the default fiber length appears too short.

Thank you for reading