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crossing fibers & fractional anisotropy #1802
Regarding the effects of crossing fibres in diffusion anisotropy, I've personally explored that as part of the following article (see, for example, the geometry of the diffusion tensor as a function of crossing fiber in figure 1):
A plot of FA vs crossing fiber can be also found in my PhD Thesis (panel A of figure 7.1.).
Other literature suggestions:
De Santis S et al. (2014). Why diffusion tensor MRI does well only some of the time: variance and covariance of white matter tissue microstructure attributes in the living human brain. Neuroimage 89, 35-44. doi: 10.1016/j.neuroimage.2013.12.003.