Computational methods have been widely used to estimate field distributions produced by conventional or recently introduced directional DBS electrodes. To date there have been no experimental measurements of fields produced by DBS. We implanted either conventional or directional DBS leads into a head-shaped homogeneous phantom filled with agar gel and compared the current densities produced by each DBS electrode type using magnetic resonance current density imaging (MRCDI). This first experimental demonstration demonstrates the expected reduced spread for directional electrodes. This approach will be used in future studies to produce detailed images of DBS fields relative to target structures.
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