Synthetic tractography experiment testing the behavior of fibers crossing at a 60° angle. As can be seen, our full tensor model performs better. The background in (b) and (c) displays the FA from a single-tensor estimation. The crossing region's FA is lower and therefore darker. a Sketch of our synthetic testing scenario. Tractography is started on the left side in a one tensor region, and the fiber has to go through a crossing region in the middle. b Results of the tractography: The existing simpler model is displayed in blue and our proposed full model is seen in red. c Close-up of the area where the fibers enter the crossing region [yellow rectangle in (b)]. The principal diffusion directions of both tensors are displayed.