If you have some problems tracking fibers with the DTI-track module, it might be because
the estimated tensors are up side down because of some geometry problems. To solve this
problem, you can flip the tensor field along the x,y,z axis in the Tensor viewer module. For that,
open the problematic tensor field in the tensor module, then click on the axis to flip on
the parameters panel (see Fig. 4.1). It may take a while to flip
the tensors.
Once you have finished, you can save the resulting tensor field by clicking ``Save the tensor field''. You will be able to load it from the DTI-track module to track fibers with the right tensor field.