TDI end-points selection

Hi every one,
this is my first post, so wish me luck :smile:
I have a problem with the TDI and I want to ask for your help. I created a TDI that includes streamlines from a certain ROI(in the below example is lh_po). The commands were

First I created the streamlines using

tckedit tracks_10M.tck lh_po.tck -include lh_po.mif -minlength 25

Then I made the TDI using

tckmap lh_po.tck -contrast tdi -template raw_t1.mif lh_po_tdi_ep.nii.gz -ends_only

Now I have an image that shows endpoints within the ROI and outside the ROI representing both sides of termination points.

What I want is to create a TDI showing only the endpoints outside the ROI and remove the ones within the ROI. Is there a way to do that through mrtrix commands?

Thanks

Mudathir