How to cut through a tractogram in volume rendering view?

1

Hello MRtrix experts,

Is there a way to cut through a tractogram (e.g., to cut through corpus callosum to only show the tracts in the left hemisphere) in the “Tractography” tool? I tried playing with “crop to slab”, but did not observe any effect.

Thanks much,
xiaoping

2

I’m afraid this can’t be done at the moment… The idea has popped into my mind on occasion, and it’s not theoretically difficult to implement, but I’d need to figure out a sensible means of interacting with it, and a lot more time than I typically have these days…

But it would definitely be worth adding a feature request as an issue in the GitHub issue tracker!

3

While it can’t be done within mrview interactively, you could pre-generate data for such a cropping operation: draw a ROI that encapsulates one of the two hemispheres only, and then use -tckedit with the -mask option. This will remove any streamline vertices that are not within the hemisphere of interest, which can then subsequently be loaded in the mrview Tractography tool.