Extracting the weighted means of individual fiber pathways can be useful when you want to quantify the microstructure of an entire white matter structure. This is specifically useful for tract based analyses, where you run statistics on specific pathways, and not the wholeRead More

It is unfortunately not common practice in diffusion imaging research to report on observed head motion of the participants in the scanner. Even though head motion can significantly influence study results (see also Yendiki et al., 2014). A recent publication by Weinberger and Radulescu (2015) reiterated theRead More

In our first tutorial we processed our raw images and calculated tensor images. In this second tutorial we will address how to normalize a set of diffusion tensor images (DTI) and then run statistics on the normalized brain images. First it is importantRead More

In DTI 101 we described how diffusion tensor imaging estimates brain microstructure by modeling diffusion of water in the brain. We briefly discuss that this is done by using ellipsoid or ball shaped tensors. This leads to the question; what is a tensor?  "Tensors are simplyRead More