hello Haykel 

thank you for your answer, in fact i'm using 0.6.0.1 windows version. i'v already processed all my images and i was hoping to find a solution to import masks to explore sub cortical area.

thank you again 

Hi Aya,

Did you check if both your tracks (trk file) and image you want to overlay (your mask,FA image, or T1 image) have the same resolution (2*2*2 or 1*1*1)? If they are different, you need to either upsample or downsample one of them. This principle applies when you overlay your FA image with any other mask (image). Also, check if the bounding box is the same. Lastly, I hope they are in the same space (MNI space, individual subject T1 space, or individual DWI space).  I hope you solve your issue. Good luck.

Dear Haemy,

thank you very much for your reply :) it was really helpful