Diffusion Tensor Imaging (DTI)
Estimates white-matter diffusion anisotropy and dominant orientation from diffusion MRI, which tractography uses to infer likely fiber pathways.
References
- Basser, P.J., Pierpaoli, C. "Microstructural and Physiological Features of Tissues." Journal of Magnetic Resonance Imaging 13, no. 4 (2001): 534–546.