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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: J Neural Eng. 2016 May 11;13(3):036023. doi: 10.1088/1741-2560/13/3/036023

Figure 6.

Figure 6

Four methods for defining anisotropy in the brain. (a) Tensor fields within grey and white matter across the four different cases (see section 2.3): Tuch cross-property relationship (CPR), classical, volume conservation (VC), and load preservation (LP). The right subthalamic nucleus is shown in pink. Note: tensors in the cerebral spinal fluid were ignored because they were > 10 times the size of tensors in the brain parenchyma. The scale bar for tensors is on the bottom right corner. Tuch CPR inset: tensors were scaled by a factor of 0.5 to limit overlap. (b) Differences in model predictions between the four different cases. Φ = potential field, DCF = descending corticofugal, Vth = voltage-regulated stimulation threshold.