Diffusion MRI of the Brain: The location of nerve fibers is inferred by tracking the movement of water molecules along them.
Diffusion MRI reveals brain connections
Portraits of the mind: diffusion MRI image
Diffusion MRI - Wikipedia
diffusion spectrum MRI (DSI) images of fiber pathways in the brain of cats at age 10 days (top) and three months
This beautiful picture is a special DTI( Diffusion MRI) imaging technique that focuses on the axons of neurons in the brain, allowing to test neuronal circuits. http://en.wikipedia.org/wiki/Diffusion_tensor_imaging#Diffusion_tensor_imaging
The brain's "connectome."
Connecting the dots: Water diffusion MRI reveals plasticity networks in remote nonstimulated brain regions
Computational Diffusion MRI: Miccai Workshop, Boston, MA, USA, September 2014