Fig. 4.
Significance of dorsal cerebrospinal fluid (dCSF) layer thickness in kilohertz frequency spinal cord stimulation. (A) Dorsal column (DC) fiber activation and conduction block thresholds for dCSF layer thicknesses of 2.0, 3.2, and 4.4 mm are shown in the left, middle, and right columns, respectively. The top row shows the activation thresholds for each dCSF layer thickness, whereas the bottom row shows the corresponding conduction block thresholds. (B) Dorsal root (DR) fiber activation thresholds for each dCSF layer thickness as a function of rostrocaudal position of the DR branch point relative to the cathode. (C) Minimum thresholds for DC and DR fiber activation and conduction block as a function of dCSF layer thickness. In this analysis, DC fibers had a diameter of 11.5 μm.

Significance of dorsal cerebrospinal fluid (dCSF) layer thickness in kilohertz frequency spinal cord stimulation. (A) Dorsal column (DC) fiber activation and conduction block thresholds for dCSF layer thicknesses of 2.0, 3.2, and 4.4 mm are shown in the left, middle, and right columns, respectively. The top row shows the activation thresholds for each dCSF layer thickness, whereas the bottom row shows the corresponding conduction block thresholds. (B) Dorsal root (DR) fiber activation thresholds for each dCSF layer thickness as a function of rostrocaudal position of the DR branch point relative to the cathode. (C) Minimum thresholds for DC and DR fiber activation and conduction block as a function of dCSF layer thickness. In this analysis, DC fibers had a diameter of 11.5 μm.

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