I’ve been trying out MRtrix 3 recently. It’s impressive software. I’ll post a guide about installing it and using it later but there is enough information to get started on the Google+ site, the GitHub repository (and associated sparse but growing wiki), and the old mrtrix2 site. The developers are quick to respond to questions and are very helpful. I’m a novice at the software at this point but am enjoying learning to use it. As an example of what it can do, I created a video scrolling through a brain in the three common planes – axial, sagittal, and coronal. In this video, I display a track density image (TDI) created from a Constrained Spherical Deconvolution (CSD) whole brain fiber tracking with 25,000,000 fibers calculated.
MRtrix is one of the most promising fiber tracking packages I’ve encountered.
Image below is a 3D rendering of the TDI created for the video.